AIRIM

Summary

AIRIM (AFG2 interacting ribosome maturation factor, HGNC:26039) is a protein-coding gene on chromosome 1p34.3, encoding AFG2-interacting ribosome maturation factor (Q9NX04). Part of the 55LCC heterohexameric ATPase complex which is chromatin-associated and promotes replisome proteostasis to maintain replication fork progression and genome stability. It is a common-essential gene (DepMap: required in 95.8% of cancer cell lines).

Involved in ribosomal large subunit biogenesis. Located in cytosol; nucleolus; and nucleoplasm.

Source: NCBI Gene 54955 — RefSeq curated summary.

At a glance

• GWAS associations: 2
• Clinical variants (ClinVar): 9 total
• Cancer dependency (DepMap): dependent in 95.8% of screened cell lines (common-essential)
• MANE Select transcript: NM_001350770

Identifiers

Gene identifiers

Field	Value
HGNC ID	HGNC:26039
Approved symbol	AIRIM
Name	AFG2 interacting ribosome maturation factor
Location	1p34.3
Locus type	gene with protein product
Status	Approved
Aliases	FLJ20508
Ensembl gene	ENSG00000116922
Ensembl biotype	protein_coding
OMIM	614799
Entrez	54955

Gene structure

Transcript identifiers

Ensembl transcripts: 35 — 29 protein_coding, 5 protein_coding_CDS_not_defined, 1 nonsense_mediated_decay

ENST00000358011, ENST00000461359, ENST00000464085, ENST00000464178, ENST00000472584, ENST00000477060, ENST00000486637, ENST00000488137, ENST00000491797, ENST00000491981, ENST00000494120, ENST00000498448, ENST00000609516, ENST00000619962, ENST00000895429, ENST00000895430, ENST00000895431, ENST00000895432, ENST00000895433, ENST00000895434, ENST00000895435, ENST00000895436, ENST00000895437, ENST00000895438, ENST00000895439, ENST00000895440, ENST00000911431, ENST00000911432, ENST00000911433, ENST00000962186, ENST00000962187, ENST00000962188, ENST00000962189, ENST00000962190, ENST00000962191

RefSeq mRNA: 20 — MANE Select: NM_001350770 NM_001303030, NM_001303031, NM_001350755, NM_001350756, NM_001350757, NM_001350758, NM_001350759, NM_001350760, NM_001350761, NM_001350762, NM_001350763, NM_001350764, NM_001350765, NM_001350766, NM_001350767, NM_001350768, NM_001350769, NM_001350770, NM_001350771, NM_017850

CCDS: CCDS423

Canonical transcript exons

ENST00000486637 — 5 exons

Exon	Start	End
ENSE00001838445	37690002	37690529
ENSE00003516572	37681570	37683160
ENSE00003706663	37689606	37689883
ENSE00003785675	37683319	37683437
ENSE00003790239	37686273	37686452

Expression profiles

Bgee: expression breadth ubiquitous, 265 present calls, max score 87.46.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 9.7536 / max 142.2393, expressed in 1741 samples.

FANTOM5 promoters (2 alternative TSS)

Promoter ID	TPM avg	Samples expressed
11792	7.1863	1670
11793	2.5673	1386

Top tissues by expression

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

Tissue	Anatomy ID	Expression score	Quality
ventricular zone	UBERON:0003053	87.46	gold quality
stromal cell of endometrium	CL:0002255	87.17	gold quality
primordial germ cell in gonad	CL:0000670 ∩ UBERON:0000991	87.16	gold quality
right coronary artery	UBERON:0001625	85.24	gold quality
ganglionic eminence	UBERON:0004023	85.24	gold quality
right ovary	UBERON:0002118	84.54	gold quality
calcaneal tendon	UBERON:0003701	84.42	gold quality
left ovary	UBERON:0002119	84.12	gold quality
body of uterus	UBERON:0009853	83.31	gold quality
popliteal artery	UBERON:0002250	83.30	gold quality
tibial artery	UBERON:0007610	83.29	gold quality
gall bladder	UBERON:0002110	83.19	gold quality
body of pancreas	UBERON:0001150	83.18	gold quality
left adrenal gland	UBERON:0001234	83.16	gold quality
right adrenal gland cortex	UBERON:0035827	83.08	gold quality
right adrenal gland	UBERON:0001233	83.06	gold quality
gastrocnemius	UBERON:0001388	82.98	gold quality
minor salivary gland	UBERON:0001830	82.80	gold quality
ovary	UBERON:0000992	82.79	gold quality
aorta	UBERON:0000947	82.76	gold quality
muscle of leg	UBERON:0001383	82.74	gold quality
prefrontal cortex	UBERON:0000451	82.66	gold quality
adrenal gland	UBERON:0002369	82.65	gold quality
male germ line stem cell (sensu Vertebrata) in testis	CL:0000089 ∩ UBERON:0000473	82.64	gold quality
cortical plate	UBERON:0005343	82.63	gold quality
left adrenal gland cortex	UBERON:0035825	82.63	gold quality
left coronary artery	UBERON:0001626	82.57	gold quality
lower esophagus	UBERON:0013473	82.54	gold quality
lower esophagus muscularis layer	UBERON:0035833	82.54	gold quality
skin of leg	UBERON:0001511	82.53	gold quality

Single-cell (SCXA)

Detected in 2 experiment(s), a significant marker in 0.

Experiment	Marker?	Max mean expression
E-MTAB-4850	no	258.62
E-ANND-3	no	0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

73 targeting AIRIM, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNA	Max score	Avg score	miRNA target_count
HSA-MIR-4262	100.00	73.26	3931
HSA-MIR-450A-1-3P	100.00	69.33	1837
HSA-MIR-3134	100.00	66.43	777
HSA-MIR-181A-5P	99.99	72.96	2995
HSA-MIR-181B-5P	99.99	72.97	2996
HSA-MIR-181C-5P	99.99	72.95	2996
HSA-MIR-181D-5P	99.99	73.04	2997
HSA-MIR-607	99.97	73.62	5593
HSA-MIR-3148	99.97	75.06	6478
HSA-MIR-1250-3P	99.96	70.04	4038
HSA-MIR-8063	99.91	69.76	3146
HSA-MIR-153-5P	99.89	73.86	6317
HSA-MIR-6780A-5P	99.88	66.69	2776
HSA-MIR-369-3P	99.85	70.52	2264
HSA-MIR-4495	99.82	72.08	3080
HSA-MIR-202-5P	99.78	67.65	991
HSA-MIR-1273H-5P	99.77	66.32	2471
HSA-MIR-1299	99.77	71.24	2389
HSA-MIR-548AG	99.77	69.25	1492
HSA-MIR-4766-5P	99.75	69.23	2662
HSA-MIR-4677-5P	99.70	70.09	1940
HSA-MIR-30B-3P	99.70	65.76	2325
HSA-MIR-3689A-3P	99.70	65.73	2306
HSA-MIR-3689B-3P	99.70	65.71	2311
HSA-MIR-3689C	99.70	65.71	2311
HSA-MIR-6779-5P	99.70	65.76	2363
HSA-MIR-548M	99.70	68.87	1749
HSA-MIR-379-3P	99.69	69.60	1524
HSA-MIR-411-3P	99.69	69.63	1524
HSA-MIR-548AI	99.69	69.24	1494

Functional genomics

DepMap (CRISPR cell-line fitness): dependent in 95.8% of screened cell lines, common-essential.

Literature-anchored findings (GeneRIF, showing 3)

• our findings suggest that C1ORF109 may be the downstream target of protein kinase CK2 and involved in the regulation of cancer cell proliferation. (PMID:22548824)
• Labeling of heterochronic ribosomes reveals C1ORF109 and SPATA5 control a late step in human ribosome assembly. (PMID:35354024)
• C1orf109 promotes malignant phenotype of liver cancer via wnt signaling pathway in a CK2-dependent manner. (PMID:36988773)

Cross-species orthologs

3 orthologs

Organism	Symbol	Gene ID
danio_rerio	airim	ENSDARG00000012113
mus_musculus	Airim	ENSMUSG00000044730
rattus_norvegicus	Airim	ENSRNOG00000025065

Protein

Protein identifiers

AFG2-interacting ribosome maturation factor — Q9NX04 (reviewed: Q9NX04)

Alternative names: Ribosome biogenesis protein C1orf109

All UniProt accessions (7): A0A087WUX7, Q9NX04, V9GY35, V9GYI2, V9GYN4, V9GYQ8, V9GYT8

UniProt curated annotations — full annotation on UniProt →

Function. Part of the 55LCC heterohexameric ATPase complex which is chromatin-associated and promotes replisome proteostasis to maintain replication fork progression and genome stability. Required for replication fork progression, sister chromatid cohesion, and chromosome stability. The ATPase activity is specifically enhanced by replication fork DNA and is coupled to cysteine protease-dependent cleavage of replisome substrates in response to replication fork damage. Uses ATPase activity to process replisome substrates in S-phase, facilitating their proteolytic turnover from chromatin to ensure DNA replication and mitotic fidelity. Involved in the cytoplasmic maturation steps of pre-60S ribosomal particles by promoting the release of shuttling protein RSL24D1/RLP24 from the pre-ribosomal particles.

Subunit / interactions. Part of the 55LCC heterohexameric ATPase complex composed at least of AIRIM, AFG2A, AFG2B and CINP. Does not associate with pre-60S ribosomal particles.

Subcellular location. Nucleus. Cytoplasm.

Post-translational modifications. Phosphorylated on serines by CK2 kinase.

Isoforms (2)

UniProt ID	Names	Canonical?
Q9NX04-1	1	yes
Q9NX04-2	2

RefSeq proteins (20): NP_001289959, NP_001289960, NP_001337684, NP_001337685, NP_001337686, NP_001337687, NP_001337688, NP_001337689, NP_001337690, NP_001337691, NP_001337692, NP_001337693, NP_001337694, NP_001337695, NP_001337696, NP_001337697, NP_001337698, NP_001337699, NP_001337700, NP_060320 (=MANE)

Domains & families (InterPro)

ID	Name	Type
IPR029159	CA109-like	Family

Pfam: PF15011

UniProt features (9 total): mutagenesis site 6, splice variant 2, chain 1

Structure

Experimental structures (PDB)

2 structures.

PDB	Method	Resolution (Å)
9GWJ	X-RAY DIFFRACTION	3.69
8RHN	ELECTRON MICROSCOPY	4.5

Predicted structure (AlphaFold)

Model	pLDDT	Fraction very-high
AF-Q9NX04-F1	94.17	0.88

Functional residue map

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

Mutagenesis-validated functional residues (6):

Position	Phenotype
63	loss of interaction with cinp. no effect on interaction with interaction with afg2a and afg2b.
69	loss of interaction with cinp. no effect on interaction with interaction with afg2a and afg2b.
73	loss of interaction with cinp. no effect on interaction with interaction with afg2a and afg2b.
104	abolishes phosphorylation by ck2 kinase; when associated with a-134 and a-182.
134	abolishes phosphorylation by ck2 kinase; when associated with a-104 and a-182.
182	abolishes phosphorylation by ck2 kinase; when associated with a-104 and a-134.

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 115 (showing top): GOBP_RIBOSOME_BIOGENESIS, GOBP_REGULATION_OF_CELLULAR_COMPONENT_BIOGENESIS, MONNIER_POSTRADIATION_TUMOR_ESCAPE_UP, WEI_MYCN_TARGETS_WITH_E_BOX, chr1p34, ZHOU_INFLAMMATORY_RESPONSE_LIVE_DN, DODD_NASOPHARYNGEAL_CARCINOMA_UP, CCAGGGG_MIR331, GOBP_RIBONUCLEOPROTEIN_COMPLEX_BIOGENESIS, GOBP_RIBOSOMAL_LARGE_SUBUNIT_BIOGENESIS, GOBP_DNA_REPLICATION, MARSON_BOUND_BY_E2F4_UNSTIMULATED, GOCC_ATPASE_COMPLEX, GOCC_NUCLEOLUS, GOBP_DNA_METABOLIC_PROCESS

GO Biological Process (2): ribosomal large subunit biogenesis (GO:0042273), ribosome biogenesis (GO:0042254)

GO Molecular Function (1): protein binding (GO:0005515)

GO Cellular Component (5): nucleus (GO:0005634), nucleoplasm (GO:0005654), nucleolus (GO:0005730), cytoplasm (GO:0005737), cytosol (GO:0005829)

GO top-level categories

Rollup of top GO terms by namespace:

Category	Terms
cellular anatomical structure	3
ribonucleoprotein complex biogenesis	2
nuclear lumen	2
ribosome biogenesis	1
binding	1
intracellular membrane-bounded organelle	1
intracellular membraneless organelle	1
intracellular anatomical structure	1
cytoplasm	1

Protein interactions and networks

STRING

640 interactions, top by confidence (×1000):

Protein A	Protein B	Partner UniProt	Score
AIRIM	CINP	Q9BW66	592
AIRIM	TMEM239	Q8WW34	580
AIRIM	MTBP	Q96DY7	472
AIRIM	SPC24	Q8NBT2	455
AIRIM	ZBED8	Q8IZ13	432
AIRIM	TTC33	Q6PID6	400
AIRIM	LRRC61	Q9BV99	400
AIRIM	RMP64	Q6NW34	397
AIRIM	SNRNP48	Q6IEG0	389
AIRIM	ASPHD2	Q6ICH7	378
AIRIM	AHCTF1	Q8WYP5	375
AIRIM	TMEM60	Q9H2L4	369
AIRIM	AUNIP	Q9H7T9	369
AIRIM	AFG2B	Q9BVQ7	353
AIRIM	IFFO1	Q0D2I5	351
AIRIM	KIAA1586	Q9HCI6	351

IntAct

549 interactions, top by confidence:

A	B	Type	Score
AIRIM	CINP	psi-mi:“MI:0915”(physical association)	0.920
CINP	AIRIM	psi-mi:“MI:0915”(physical association)	0.920
AIRIM	ZBED1	psi-mi:“MI:0915”(physical association)	0.780
ZBED1	AIRIM	psi-mi:“MI:0915”(physical association)	0.780
AIRIM	CEP55	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	NECAB2	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	TADA2A	psi-mi:“MI:0915”(physical association)	0.720
STX11	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	KRT19	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	TRAF1	psi-mi:“MI:0915”(physical association)	0.720
KRT31	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
RINT1	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	IHO1	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	VPS52	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	LZTS2	psi-mi:“MI:0915”(physical association)	0.720
KATNAL1	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
TRIM54	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	RNF41	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	TFIP11	psi-mi:“MI:0915”(physical association)	0.720
AIRIM	IKZF3	psi-mi:“MI:0915”(physical association)	0.720
NECAB2	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
KRT19	AIRIM	psi-mi:“MI:0915”(physical association)	0.720
TRAF1	AIRIM	psi-mi:“MI:0915”(physical association)	0.720

BioGRID (191): C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid), C1orf109 (Two-hybrid)

ESM2 similar proteins: A0A0B4K7J2, A0A8W7Q4I4, A3N0I5, A4GCJ9, A5PK29, A7MEF1, A8C8J6, A8GDD4, A8GG50, B2SYW1, B3H1G2, B3R8A8, B4I608, B4QAF0, F7IW82, O84621, O86418, P03487, P0C267, P0DOF4, P0DOF7, P10355, P22047, P35937, P63234, P73889, P74103, Q0A2E3, Q13U06, Q2ICQ8, Q2PIK4, Q2PIM0, Q2PIM4, Q30NP9, Q38SQ6, Q3TC33, Q3YPZ3, Q44212, Q463X3, Q67161

Diamond homologs: Q28I03, Q499E6, Q8JHH5, Q9NX04

SIGNOR signaling

1 interactions.

A	Effect	B	Mechanism
AIRIM	“form complex”	“SPATA5-SPATA5L1 ATPase complex”	binding

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 70 IntAct physical interaction partners (hypergeometric vs the genome-wide background, BH-FDR, gene-set size 15–500, ranked by fold). A functional readout of the neighbourhood — distinct from this gene’s own memberships above, and biased toward well-studied / hub proteins, so read it as themes rather than proof.

Reactome pathways:

Pathway	Partners	Fold	FDR
Formation of the cornified envelope	7	18.6×	1e-05
Keratinization	7	11.8×	1e-04

GO biological processes:

GO term	Partners	Fold	FDR
morphogenesis of an epithelium	7	39.5×	2e-07
intermediate filament organization	7	27.6×	1e-06
epithelial cell differentiation	5	14.4×	3e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

Classification	Count (floor)
Pathogenic	0
Likely pathogenic	0
Uncertain significance	2
Likely benign	1
Benign	0

Top pathogenic / likely-pathogenic (0)

SpliceAI

955 predictions. Top by Δscore:

Variant	Effect	Δscore
1:37683158:TAT:T	acceptor_gain	1.0000
1:37683158:TATCT:T	acceptor_loss	1.0000
1:37683160:TCTGA:T	acceptor_loss	1.0000
1:37683161:C:CC	acceptor_gain	1.0000
1:37683161:CT:C	acceptor_loss	1.0000
1:37683162:T:C	acceptor_loss	1.0000
1:37686272:CGA:C	donor_gain	1.0000
1:37686293:AATAT:A	donor_gain	1.0000
1:37686336:A:AC	donor_gain	1.0000
1:37686337:C:CC	donor_gain	1.0000
1:37686337:CTG:C	donor_gain	1.0000
1:37686448:TGGCT:T	acceptor_gain	1.0000
1:37686449:GGCT:G	acceptor_gain	1.0000
1:37686450:GCTC:G	acceptor_loss	1.0000
1:37686451:CT:C	acceptor_gain	1.0000
1:37686452:TCTGC:T	acceptor_loss	1.0000
1:37686453:C:CC	acceptor_gain	1.0000
1:37686453:CTGC:C	acceptor_loss	1.0000
1:37686454:T:G	acceptor_loss	1.0000
1:37689604:A:AC	donor_gain	1.0000
1:37689604:ACAGC:A	donor_gain	1.0000
1:37689605:C:CC	donor_gain	1.0000
1:37689605:CAG:C	donor_gain	1.0000
1:37689605:CAGCC:C	donor_gain	1.0000
1:37689612:T:A	donor_gain	1.0000
1:37689619:G:C	donor_gain	1.0000
1:37689656:A:AC	donor_gain	1.0000
1:37689656:ACG:A	donor_gain	1.0000
1:37689657:C:CC	donor_gain	1.0000
1:37689657:CG:C	donor_gain	1.0000

AlphaMissense

715 scored. Top likely-pathogenic:

Variant	Protein change	am_pathogenicity
1:37689683:G:C	F66L	0.949
1:37689683:G:T	F66L	0.949
1:37689685:A:G	F66L	0.949
1:37689663:A:G	L73P	0.923
1:37689735:A:G	L49P	0.897
1:37689799:A:G	W28R	0.887
1:37689799:A:T	W28R	0.887
1:37689827:G:C	F18L	0.879
1:37689827:G:T	F18L	0.879
1:37689829:A:G	F18L	0.879
1:37689840:A:G	L14P	0.876
1:37689828:A:G	F18S	0.873
1:37686432:C:G	R99P	0.871
1:37689756:A:G	L42P	0.864
1:37689730:C:G	A51P	0.862
1:37689639:C:T	G81D	0.853
1:37689653:C:A	K76N	0.848
1:37689653:C:G	K76N	0.848
1:37689737:C:A	Q48H	0.844
1:37689737:C:G	Q48H	0.844
1:37689744:G:T	A46E	0.837
1:37689675:A:G	L69S	0.836
1:37689745:C:G	A46P	0.830
1:37689828:A:C	F18C	0.824
1:37689756:A:T	L42H	0.823
1:37689797:C:A	W28C	0.819
1:37689797:C:G	W28C	0.819
1:37686423:A:T	V102D	0.805
1:37689640:C:G	G81R	0.804
1:37689684:A:G	F66S	0.800

dbSNP variants (sampled 300 via entrez): RS1000159373 (1:37687826 G>C), RS1000316293 (1:37688188 C>T), RS1000468782 (1:37691486 C>T), RS1000496392 (1:37686764 G>A,T), RS1000823175 (1:37691036 G>C), RS1001104245 (1:37692150 A>C), RS1001147502 (1:37690485 A>C,T), RS1001206307 (1:37690624 C>T), RS1001287945 (1:37687448 T>A), RS1001416104 (1:37684448 C>G,T), RS1001764068 (1:37684179 A>C,T), RS1001945945 (1:37692632 C>A), RS1002159646 (1:37691930 C>A,G,T), RS1002211938 (1:37692100 A>G), RS1002363912 (1:37685507 A>G)

Disease associations

OMIM: gene MIM:614799 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

2 associations (top):

Study	Trait	p-value
GCST002115_4	Axial length	4.000000e-13
GCST003476_2	Eyebrow thickness	7.000000e-06

EFO canonical traits (1, from GWAS)

EFO ID	Trait name
EFO:0005318	axial length measurement

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

25 total (human), top 25 by PubMed support.

Chemical	Actions (top 5)	PubMed papers
Air Pollutants	increases oxidation, increases expression, affects cotreatment, decreases expression, increases abundance	3
Tetrachlorodibenzodioxin	decreases expression	2
Particulate Matter	decreases expression, increases abundance, increases expression	2
aristolochic acid I	increases expression	1
alpha-pinene	affects cotreatment, decreases expression, increases oxidation, increases abundance	1
bisphenol A	affects cotreatment, decreases methylation	1
sodium arsenite	increases expression	1
methacrylaldehyde	increases oxidation, increases abundance, affects cotreatment, decreases expression	1
2-palmitoylglycerol	increases expression	1
Bortezomib	increases expression	1
Sunitinib	increases expression	1
Fulvestrant	affects cotreatment, decreases methylation	1
Acrolein	increases abundance, affects cotreatment, decreases expression, increases oxidation	1
Benzo(a)pyrene	decreases methylation	1
Estradiol	increases expression	1
Hydrogen Peroxide	decreases expression	1
Ozone	decreases expression, increases oxidation, increases abundance, affects cotreatment	1
Phthalic Acids	affects methylation	1
Silicon Dioxide	increases expression	1
Smoke	decreases expression	1
Dronabinol	decreases expression	1
Tobacco Smoke Pollution	increases expression	1
Valproic Acid	increases expression, increases methylation	1
Cyclosporine	increases expression	1
Volatile Organic Compounds	affects cotreatment, decreases expression, increases oxidation	1

Clinical trials (associated diseases)

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