SMIM1

gene
On this page

Also known as Vel

Summary

SMIM1 (small integral membrane protein 1 (Vel blood group), HGNC:44204) is a protein-coding gene on chromosome 1p36.32, encoding Small integral membrane protein 1 (B2RUZ4). Regulator of red blood cell formation.

This gene encodes a small, conserved protein that participates in red blood cell formation. The encoded protein is localized to the cell membrane and is the antigen for the Vel blood group. Alternative splicing results in different transcript variants that encode the same protein.

Source: NCBI Gene 388588 — RefSeq curated summary.

At a glance

  • GWAS associations: 27
  • Clinical variants (ClinVar): 11 total
  • MANE Select transcript: NM_001288583

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:44204
Approved symbolSMIM1
Namesmall integral membrane protein 1 (Vel blood group)
Location1p36.32
Locus typegene with protein product
StatusApproved
AliasesVel
Ensembl geneENSG00000235169
Ensembl biotypeprotein_coding
OMIM615242
Entrez388588

Gene structure

Transcript identifiers

Ensembl transcripts: 11 — 11 protein_coding

ENST00000444870, ENST00000452264, ENST00000561886, ENST00000642557, ENST00000863967, ENST00000863968, ENST00000863969, ENST00000863970, ENST00000863971, ENST00000966426, ENST00000966427

RefSeq mRNA: 4 — MANE Select: NM_001288583 NM_001163724, NM_001288583, NM_001379690, NM_001379691

CCDS: CCDS57966

Canonical transcript exons

ENST00000642557 — 4 exons

ExonStartEnd
ENSE0000164699737730633773181
ENSE0000176012237752993775483
ENSE0000382337537757953775956
ENSE0000382584737727493772788

Expression profiles

Bgee: expression breadth ubiquitous, 168 present calls, max score 92.84.

FANTOM5 (CAGE): breadth broad, TPM avg 3.0967 / max 154.6030, expressed in 883 samples.

FANTOM5 promoters (3 alternative TSS)

Promoter IDTPM avgSamples expressed
3271.3378325
3251.2119553
3260.5469297

Top tissues by expression

244 total, by Bgee expression score (0-100, higher = more expressed):

TissueAnatomy IDExpression scoreQuality
right testisUBERON:000453492.84gold quality
left testisUBERON:000453392.28gold quality
right atrium auricular regionUBERON:000663191.88gold quality
cardiac atriumUBERON:000208190.73gold quality
testisUBERON:000047390.02gold quality
parotid glandUBERON:000183188.58gold quality
apex of heartUBERON:000209887.83gold quality
adenohypophysisUBERON:000219685.33gold quality
bloodUBERON:000017884.90gold quality
male germ line stem cell (sensu Vertebrata) in testisCL:0000089 ∩ UBERON:000047384.21gold quality
right lobe of liverUBERON:000111484.15gold quality
trabecular bone tissueUBERON:000248384.15gold quality
pituitary glandUBERON:000000783.57gold quality
bone marrowUBERON:000237182.99gold quality
bone marrow cellCL:000209282.38gold quality
heartUBERON:000094881.62gold quality
pancreatic ductal cellCL:000207981.50silver quality
heart left ventricleUBERON:000208481.40gold quality
kidney epitheliumUBERON:000481981.31gold quality
cardiac ventricleUBERON:000208281.15gold quality
adult mammalian kidneyUBERON:000008281.06gold quality
saliva-secreting glandUBERON:000104480.80gold quality
left lobe of thyroid glandUBERON:000112079.99gold quality
C1 segment of cervical spinal cordUBERON:000646979.66gold quality
olfactory segment of nasal mucosaUBERON:000538679.59gold quality
minor salivary glandUBERON:000183079.55gold quality
upper arm skinUBERON:000426379.38gold quality
body of pancreasUBERON:000115078.95gold quality
left ovaryUBERON:000211978.79gold quality
right lobe of thyroid glandUBERON:000111978.76gold quality

Single-cell (SCXA)

Detected in 15 experiment(s), a significant marker in 12.

ExperimentMarker?Max mean expression
E-MTAB-9388yes330.54
E-MTAB-8205yes201.64
E-HCAD-4yes160.47
E-HCAD-6yes60.21
E-CURD-112yes52.86
E-MTAB-10042yes45.35
E-HCAD-10yes30.29
E-GEOD-134144yes29.46
E-MTAB-3929yes26.23
E-MTAB-9221yes12.21
E-ANND-3yes11.30
E-HCAD-9yes7.85
E-MTAB-9067no3.23
E-MTAB-9801no2.74
E-MTAB-9467no1.11

Regulation

Is transcription factor: no

Literature-anchored findings (GeneRIF, showing 14)

  • A cohort of 70 Vel- individuals was found to be uniformly homozygous for a 17 nucleotide deletion in the coding sequence of SMIM1. (PMID:23505126)
  • Loss of SMIM1 is associated with reduction in red blood cell formation. (PMID:23563606)
  • Loss of SMIM1 is associated with reduction in red blood cell formation. (PMID:23563608)
  • Weak Vel expression levels are caused by multiple genetic factors in SMIM1 and probably also by other genetic or environmental factors. (PMID:25647324)
  • SMIM1 carries the Vel antigen as a type II membrane protein with a predicted C-terminal extracellular domain of only 3-12 amino acids (PMID:26452714)
  • Alleles that initially entered the population have been maintained within the population. The c.64_80del null allele of SMIM1 is one such allele, thus having implications for transfusion medicine and child or maternal health. (PMID:26666208)
  • Among the 448 samples analysed, 10 (2.23%) harboured the 17 bp deletion of the gene SMIM1, and all were heterozygote for the SMIM1*64_80 del allele. (PMID:27328373)
  • rs1175550G and to a lesser extent rs143702418C independently increase SMIM1 and Vel antigen expression. (PMID:28084402)
  • the present study demonstrated that although the SMIM1*64_80del allele is responsible for some variation of Vel phenotype in this donor population, Vel expression is also controlled by molecular changes in SMIM1 intron 2. (PMID:29517970)
  • Identification of a novel single-nucleotide mutation in SMIM1 gene that results in low Vel antigen expression. (PMID:31218697)
  • Dimerization of small integral membrane protein 1 promotes cell surface presentation of the Vel blood group epitope. (PMID:31879955)
  • SMIM1, carrier of the Vel blood group, is a tail-anchored transmembrane protein and readily forms homodimers in a cell-free system. (PMID:32301496)
  • SMIM1 missense mutations exert their effect on wild type Vel expression late in erythroid differentiation. (PMID:33128268)
  • SMIM1 absence is associated with reduced energy expenditure and excess weight. (PMID:38906141)

Cross-species orthologs

2 orthologs

OrganismSymbolGene ID
mus_musculusSmim1ENSMUSG00000078350
rattus_norvegicusSmim1ENSRNOG00000080057

Protein

Protein identifiers

Small integral membrane protein 1B2RUZ4 (reviewed: B2RUZ4)

Alternative names: Vel blood group antigen

All UniProt accessions (4): B2RUZ4, A0A2R8Y7R4, H3BS66, M4WDD3

UniProt curated annotations — full annotation on UniProt →

Function. Regulator of red blood cell formation.

Subunit / interactions. Homooligomer; disulfide-linked.

Subcellular location. Cell membrane.

Tissue specificity. Highly expressed in the bone marrow and expressed at lower levels in non-hematopoietic tissues. Highly expressed in erythroleukemia cell lines. Up-regulated in CD34+ hematopoietic progenitors cultured toward red blood cells.

Domain organisation. The extracellular domain carries the Vel antigen.

Polymorphism. SMIM1 is responsible for the Vel blood group system (VEL) [MIM:615264]. The Vel antigen is present on red blood cells from all people except rare Vel-negative individuals who can form antibodies to Vel in response to transfusion or pregnancy. These antibodies may cause severe hemolytic reactions in blood recipients. In most cases, Vel-negative individuals are homozygous for a 17-nucleotide frameshift deletion in exon 3. In some cases, Vel-negative are heterozygous for the 17-nucleotide frameshift deletion and a missense variant at position 51.

Similarity. Belongs to the SMIM1 family.

RefSeq proteins (4): NP_001157196, NP_001275512, NP_001366619, NP_001366620 (=MANE)

Domains & families (InterPro)

IDNameType
IPR031744SMIM1Family

Pfam: PF15875

UniProt features (21 total): mutagenesis site 7, modified residue 5, topological domain 2, sequence variant 2, region of interest 2, chain 1, transmembrane region 1, compositionally biased region 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-B2RUZ4-F170.790.23

Functional residue map

Curated UniProt residues grouped by drug-discovery relevance — catalytic, ligand-binding, modification, and mutation-validated positions. Source: UniProtKB sequence features.

Post-translational modifications (5): 22, 27, 1, 6, 17

Mutagenesis-validated functional residues (7):

PositionPhenotype
6no effect on cell membrane localization; when associated with a-17; a-22 and a-27. no effect on cell surface expression
17no effect on cell membrane localization; when associated with a-6; a-22 and a-27. no effect on cell surface expression o
22no effect on cell membrane localization; when associated with a-6; a-17 and a-27. no effect on cell surface expression o
27no effect on cell membrane localization; when associated with a-6; a-17 and a-22. no effect on cell surface expression o
35no effect on cell surface expression of the vel antigen; when associated with s-43.
43no effect on cell surface expression of the vel antigen; when associated with s-35.
76–78loss of cell-surface expression of the vel antigen.

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 52 (showing top): GOBP_MYELOID_CELL_DIFFERENTIATION, GOBP_MYELOID_CELL_HOMEOSTASIS, GOBP_MYELOID_CELL_DEVELOPMENT, GOBP_ERYTHROCYTE_HOMEOSTASIS, GOCC_CELL_SURFACE, CHANDRAN_METASTASIS_DN, GUO_HEX_TARGETS_DN, GOBP_MULTICELLULAR_ORGANISMAL_LEVEL_HOMEOSTASIS, GOBP_ERYTHROCYTE_DEVELOPMENT, GOBP_HOMEOSTATIC_PROCESS, GOMF_PROTEIN_DIMERIZATION_ACTIVITY, GOMF_PROTEIN_HOMODIMERIZATION_ACTIVITY, GOBP_HOMEOSTASIS_OF_NUMBER_OF_CELLS, chr1p36, CHYLA_CBFA2T3_TARGETS_DN

GO Biological Process (0):

GO Molecular Function (2): protein homodimerization activity (GO:0042803), protein binding (GO:0005515)

GO Cellular Component (3): plasma membrane (GO:0005886), cell surface (GO:0009986), membrane (GO:0016020)

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure2
identical protein binding1
protein dimerization activity1
binding1
membrane1
cell periphery1

Protein interactions and networks

STRING

212 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
SMIM1HDXQ7Z353572
SMIM1SMIM3Q9BZL3530
SMIM1NME7Q9Y5B8463
SMIM1SMIM2Q9BVW6446
SMIM1PRRT4C9JH25430
SMIM1DOK3Q7L591388
SMIM1ATP6AP1LQ52LC2388
SMIM1EFCAB8A8MWE9377
SMIM1MTG1Q9BT17366
SMIM1NPLQ9BXD5348
SMIM1VPS37AQ8NEZ2343
SMIM1TROQ12816325
SMIM1GATA1P15976323
SMIM1RHCEP18577318
SMIM1KELP23276314

IntAct

172 interactions, top by confidence:

ABTypeScore
SMIM1TMX2psi-mi:“MI:0915”(physical association)0.560
SMIM1LHFPL5psi-mi:“MI:0915”(physical association)0.560
SMIM1HACD2psi-mi:“MI:0915”(physical association)0.560
SMIM1CYB561psi-mi:“MI:0915”(physical association)0.560
SMIM1COMTpsi-mi:“MI:0915”(physical association)0.560
SMIM1LRRC4Cpsi-mi:“MI:0915”(physical association)0.560
SMIM1STING1psi-mi:“MI:0915”(physical association)0.560
SMIM1NDUFAF2psi-mi:“MI:0915”(physical association)0.560
SMIM1HSD17B13psi-mi:“MI:0915”(physical association)0.560
SMIM1SLC26A11psi-mi:“MI:0915”(physical association)0.560
SMIM1ANKS6psi-mi:“MI:0915”(physical association)0.560
SMIM1STX1Apsi-mi:“MI:0915”(physical association)0.560
SMIM1MFFpsi-mi:“MI:0915”(physical association)0.560
SMIM1CD74psi-mi:“MI:0915”(physical association)0.560
SMIM1BCL2L13psi-mi:“MI:0915”(physical association)0.560
SMIM1BIKpsi-mi:“MI:0915”(physical association)0.560
SMIM1NAALAD2psi-mi:“MI:0915”(physical association)0.560
SDC3SMIM1psi-mi:“MI:0915”(physical association)0.560
SMIM1psi-mi:“MI:0915”(physical association)0.560
SMIM1CREB3L1psi-mi:“MI:0915”(physical association)0.560
SMIM1TMPRSS2psi-mi:“MI:0915”(physical association)0.560
SMIM1AQP6psi-mi:“MI:0915”(physical association)0.560

BioGRID (62): SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid), SMIM1 (Two-hybrid)

ESM2 similar proteins: A4IG66, B2RUZ4, B3DHH5, F1NVK6, F1Q930, O70367, O76024, O77770, O95772, P02683, P0C8K7, P42857, P56695, P84889, Q0P4Z1, Q15053, Q1JPG0, Q28DG6, Q2TBG9, Q4QQM5, Q4R5Q3, Q56JY4, Q5BLE2, Q5M836, Q5RF46, Q5XJS0, Q5ZKK0, Q62092, Q6GR21, Q6IQA2, Q6NRB7, Q6P606, Q7L4E1, Q7Z3D4, Q8BG50, Q8BK03, Q8BXV2, Q8IUW5, Q8K2J7, Q8NAN2

Diamond homologs: B2RUZ4, B3DHH5, P0C8K7

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

11 variants total. Per-class counts are floors (≥ shown; pagination cap):

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance8
Likely benign2
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

642 predictions. Top by Δscore:

VariantEffectΔscore
1:3773169:C:Tdonor_gain0.9900
1:3773180:GG:Gdonor_gain0.9900
1:3773181:GG:Gdonor_gain0.9900
1:3773181:GGTAA:Gdonor_loss0.9900
1:3773182:GTAA:Gdonor_loss0.9900
1:3773183:T:Adonor_loss0.9900
1:3773653:G:GTdonor_gain0.9900
1:3773677:G:GTdonor_gain0.9900
1:3773725:C:Gdonor_gain0.9900
1:3775297:A:AGacceptor_gain0.9900
1:3775298:G:GGacceptor_gain0.9900
1:3775387:A:Tdonor_gain0.9900
1:3775405:G:GGdonor_gain0.9900
1:3773182:G:GGdonor_gain0.9800
1:3773184:AAGT:Adonor_loss0.9800
1:3773739:A:Tdonor_gain0.9800
1:3775298:GT:Gacceptor_gain0.9800
1:3775298:GTGA:Gacceptor_gain0.9800
1:3773724:GCTGG:Gdonor_gain0.9700
1:3773646:G:GTdonor_gain0.9600
1:3775298:GTGAA:Gacceptor_gain0.9600
1:3772866:GC:Gdonor_gain0.9500
1:3773753:G:GAdonor_gain0.9500
1:3773750:G:GAdonor_gain0.9400
1:3775793:AG:Aacceptor_gain0.9400
1:3775794:GG:Gacceptor_gain0.9400
1:3772839:C:Tdonor_gain0.9200
1:3773179:CGG:Cdonor_gain0.9200
1:3773180:GGG:Gdonor_gain0.9200
1:3773637:TC:Tdonor_gain0.9200

AlphaMissense

471 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
1:3775883:G:CG67R0.908
1:3775884:G:AG67D0.896
1:3775865:T:AW61R0.877
1:3775865:T:CW61R0.877
1:3775412:G:CW13C0.860
1:3775412:G:TW13C0.860
1:3775896:G:AG71D0.850
1:3775874:T:CF64L0.822
1:3775876:C:AF64L0.822
1:3775876:C:GF64L0.822
1:3775895:G:CG71R0.816
1:3775893:C:AT70K0.765
1:3775886:T:GY68D0.747
1:3775840:G:CK52N0.742
1:3775840:G:TK52N0.742
1:3775851:G:AG56D0.723
1:3775898:T:GY72D0.721
1:3775862:T:CF60L0.714
1:3775864:C:AF60L0.714
1:3775864:C:GF60L0.714
1:3775410:T:AW13R0.706
1:3775410:T:CW13R0.706
1:3775895:G:TG71C0.693
1:3775875:T:CF64S0.673
1:3775893:C:GT70R0.669
1:3775857:C:AA58D0.666
1:3775883:G:TG67C0.663
1:3775884:G:TG67V0.663
1:3775886:T:CY68H0.658
1:3775896:G:TG71V0.642

dbSNP variants (sampled 300 via entrez): RS1000308514 (1:3772261 C>T), RS1001074497 (1:3771965 C>A), RS1001232288 (1:3773192 G>A), RS1001263621 (1:3773512 C>G,T), RS1002088396 (1:3770981 A>G), RS1002229863 (1:3774464 C>T), RS1002280807 (1:3774685 C>G,T), RS1002280963 (1:3776008 C>A,G,T), RS1002886403 (1:3775167 T>C), RS1003825750 (1:3776220 G>A,C), RS1003835618 (1:3776402 G>C), RS1004033438 (1:3771083 G>C), RS1004171101 (1:3774419 G>A), RS1004489578 (1:3771297 G>A,C), RS1004827898 (1:3775258 A>C,G)

Disease associations

OMIM: gene MIM:615242 | disease phenotypes:

GenCC curated gene-disease

Mondo (1): breast ductal adenocarcinoma (MONDO:0005590)

Orphanet (0):

HPO phenotypes

0 total (0 of 0 shown, HPO-id order):

GWAS associations

27 associations (top):

StudyTraitp-value
GCST004601_1Red blood cell count9.000000e-13
GCST004605_1Mean corpuscular hemoglobin concentration1.000000e-43
GCST004611_101High light scatter reticulocyte count1.000000e-49
GCST004612_191High light scatter reticulocyte percentage of red cells2.000000e-43
GCST004619_15Reticulocyte fraction of red cells3.000000e-34
GCST004621_1Red cell distribution width1.000000e-17
GCST004622_99Reticulocyte count2.000000e-42
GCST004628_1Immature fraction of reticulocytes3.000000e-27
GCST006804_195Red cell distribution width5.000000e-12
GCST010083_47Hemoglobin levels1.000000e-28
GCST90002383_142Hematocrit9.000000e-10
GCST90002384_523Hemoglobin2.000000e-33
GCST90002385_597High light scatter reticulocyte count8.000000e-85
GCST90002385_598High light scatter reticulocyte count2.000000e-17
GCST90002386_302High light scatter reticulocyte percentage of red cells5.000000e-72
GCST90002386_303High light scatter reticulocyte percentage of red cells5.000000e-16
GCST90002387_188Immature fraction of reticulocytes1.000000e-38
GCST90002391_52Mean corpuscular hemoglobin concentration8.000000e-93
GCST90002392_147Mean corpuscular volume7.000000e-20
GCST90002397_168Mean spheric corpuscular volume6.000000e-80
GCST90002403_29Red blood cell count3.000000e-24
GCST90002404_424Red cell distribution width4.000000e-46
GCST90002404_450Red cell distribution width5.000000e-42
GCST90002405_587Reticulocyte count9.000000e-79
GCST90002405_588Reticulocyte count1.000000e-16
GCST90002406_126Reticulocyte fraction of red cells1.000000e-64
GCST90002406_127Reticulocyte fraction of red cells5.000000e-15

EFO canonical traits (6, from GWAS)

EFO IDTrait name
EFO:0004305erythrocyte count
EFO:0004528mean corpuscular hemoglobin concentration
EFO:0007986reticulocyte count
EFO:0009188Red cell distribution width
EFO:0004509hemoglobin measurement
EFO:0004348hematocrit

MeSH disease descriptors (1)

DescriptorNameTree numbers
D018270Carcinoma, Ductal, BreastC04.557.470.200.025.232.500; C04.557.470.615.132.500; C04.588.180.390; C17.800.090.500.390

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

PharmGKB: 1 entry (VIP=true, CPIC=false)

CTD chemical–gene interactions

24 total (human), top 24 by PubMed support.

ChemicalActions (top 5)PubMed papers
Air Pollutantsdecreases expression, increases abundance, increases expression2
Particulate Matterdecreases expression, decreases reaction, increases abundance, increases expression2
aristolochic acid Idecreases expression1
afuresertibincreases expression1
FR900359affects phosphorylation1
propionaldehydeincreases expression1
ICG 001increases expression1
abrinedecreases expression1
2-methyl-2H-pyrazole-3-carboxylic acid (2-methyl-4-o-tolylazophenyl)amidedecreases expression, decreases reaction1
4-(4-((5-(4,5-dimethyl-2-nitrophenyl)-2-furanyl)methylene)-4,5-dihydro-3-methyl-5-oxo-1H-pyrazol-1-yl)benzoic acidincreases expression1
Sunitinibdecreases expression1
Vehicle Emissionsdecreases expression, decreases reaction1
Benzo(a)pyreneaffects methylation, decreases methylation1
Caffeineincreases phosphorylation1
Copperaffects abundance1
Smokedecreases expression, increases abundance1
Thiramdecreases expression1
Tobacco Smoke Pollutiondecreases expression1
Tretinoindecreases expression1
Urethanedecreases expression1
Valproic Acidincreases methylation1
Aflatoxin B1decreases methylation1
Okadaic Aciddecreases expression1
S-Nitrosoglutathioneincreases expression1

Clinical trials (associated diseases)

11 trials via MONDO — disease-level, not drug-specific.

TrialPhaseStatusTitle
NCT03414970PHASE3ACTIVE_NOT_RECRUITINGHypofractionated Radiation Therapy After Mastectomy in Preventing Recurrence in Patients With Stage IIa-IIIa Breast Cancer
NCT00461344PHASE2TERMINATEDDocetaxel + Doxorubicin as Neoadjuvant Chemotherapy in Patients With Breast Cancer
NCT07499999PHASE2NOT_YET_RECRUITINGRandomized Double-Blind Phase II Trial of Baby Exemestane Versus Baby Tamoxifen in Post-Menopausal Women at High Risk for Breast Cancer
NCT00637364PHASE1/PHASE2SUSPENDEDHigh Intensity Focused Ultrasound Tumor Treatment for Pancreatic Cancer Pain
NCT02779855PHASE1/PHASE2COMPLETEDTalimogene Laherparepvec in Combination With Neoadjuvant Chemotherapy in Triple Negative Breast Cancer
NCT01753908EARLY_PHASE1COMPLETEDBroccoli Sprout Extract in Treating Patients With Breast Cancer
NCT01796041EARLY_PHASE1COMPLETEDIntraoperative Imaging of Breast Cancer With Indocyanine Green
NCT01208974Not specifiedACTIVE_NOT_RECRUITINGNipple-Areola Complex (NAC) Irradiation After Nipple-Sparing Mastectomy and Reconstruction
NCT01875198Not specifiedTERMINATEDOncologic Impact of Splenectomy-omitting Radical Pancreatectomy in Well-selected Left-sided Pancreatic Cancer
NCT03543397Not specifiedUNKNOWNMRI in Ductal Carcinoma in Situ (DCIS)
NCT03834532Not specifiedCOMPLETEDLiving Well After Breast Surgery

No linked Atlas pages yet — the cross-entity mesh grows as the corpus expands.