CYB5R2

gene
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Summary

CYB5R2 (cytochrome b5 reductase 2, HGNC:24376) is a protein-coding gene on chromosome 11p15.4, encoding NADH-cytochrome b5 reductase 2 (Q6BCY4). NADH-cytochrome b5 reductases are involved in desaturation and elongation of fatty acids, cholesterol biosynthesis, drug metabolism, and, in erythrocyte, methemoglobin reduction.

The protein encoded by this gene belongs to the flavoprotein pyridine nucleotide cytochrome reductase family of proteins. Cytochrome b-type NAD(P)H oxidoreductases are implicated in many processes including cholesterol biosynthesis, fatty acid desaturation and elongation, and respiratory burst in neutrophils and macrophages. Cytochrome b5 reductases have soluble and membrane-bound forms that are the product of alternative splicing. In animal cells, the membrane-bound form binds to the endoplasmic reticulum, where it is a member of a fatty acid desaturation complex. Alternative splicing results in multiple transcript variants.

Source: NCBI Gene 51700 — RefSeq curated summary.

At a glance

  • GWAS associations: 5
  • Clinical variants (ClinVar): 74 total
  • MANE Select transcript: NM_016229

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:24376
Approved symbolCYB5R2
Namecytochrome b5 reductase 2
Location11p15.4
Locus typegene with protein product
StatusApproved
Ensembl geneENSG00000166394
Ensembl biotypeprotein_coding
OMIM608342
Entrez51700

Gene structure

Transcript identifiers

Ensembl transcripts: 32 — 25 protein_coding, 5 retained_intron, 2 protein_coding_CDS_not_defined

ENST00000299498, ENST00000436351, ENST00000524608, ENST00000524790, ENST00000525307, ENST00000526084, ENST00000527542, ENST00000528585, ENST00000531096, ENST00000532621, ENST00000532920, ENST00000533558, ENST00000534443, ENST00000534698, ENST00000872666, ENST00000872667, ENST00000872668, ENST00000872669, ENST00000872670, ENST00000872671, ENST00000872672, ENST00000872673, ENST00000872674, ENST00000872675, ENST00000917892, ENST00000917893, ENST00000917894, ENST00000917895, ENST00000917896, ENST00000917897, ENST00000954656, ENST00000954657

RefSeq mRNA: 3 — MANE Select: NM_016229 NM_001302826, NM_001302827, NM_016229

CCDS: CCDS7780

Canonical transcript exons

ENST00000299498 — 9 exons

ExonStartEnd
ENSE0000110258576664517666550
ENSE0000216034276734197673500
ENSE0000350947776727487672891
ENSE0000352225976677287667813
ENSE0000357084076696257669731
ENSE0000359617776724517672523
ENSE0000366135676684787668561
ENSE0000368754276651047665546
ENSE0000378736276692057669334

Expression profiles

Bgee: expression breadth ubiquitous, 247 present calls, max score 98.48.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 6.9797 / max 124.9505, expressed in 1175 samples.

FANTOM5 promoters (8 alternative TSS)

Promoter IDTPM avgSamples expressed
1184753.4267845
1184663.11001049
1184740.2759144
1184680.071111
1184670.03987
1184760.02559
1184690.01715
1184650.01372

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
left testisUBERON:000453398.48gold quality
right testisUBERON:000453498.39gold quality
tibial nerveUBERON:000132398.14gold quality
testisUBERON:000047396.73gold quality
spermCL:000001996.29gold quality
sural nerveUBERON:001548895.78gold quality
male germ cellCL:000001595.35gold quality
skin of abdomenUBERON:000141694.77gold quality
skin of legUBERON:000151194.22gold quality
adult organismUBERON:000702393.42gold quality
olfactory segment of nasal mucosaUBERON:000538692.69gold quality
zone of skinUBERON:000001492.48gold quality
minor salivary glandUBERON:000183091.49gold quality
C1 segment of cervical spinal cordUBERON:000646991.26gold quality
body of uterusUBERON:000985390.92gold quality
primordial germ cell in gonadCL:0000670 ∩ UBERON:000099189.78gold quality
left ovaryUBERON:000211989.51gold quality
mouth mucosaUBERON:000372989.40gold quality
spinal cordUBERON:000224089.29gold quality
saliva-secreting glandUBERON:000104488.89gold quality
right ovaryUBERON:000211888.05gold quality
ectocervixUBERON:001224987.97gold quality
corpus callosumUBERON:000233687.85gold quality
putamenUBERON:000187487.74gold quality
endocervixUBERON:000045887.73gold quality
lower esophagus mucosaUBERON:003583487.40gold quality
esophagus mucosaUBERON:000246987.28gold quality
calcaneal tendonUBERON:000370187.11gold quality
ascending aortaUBERON:000149687.07gold quality
ovaryUBERON:000099287.02gold quality

Single-cell (SCXA)

Detected in 1 experiment(s), a significant marker in 1.

ExperimentMarker?Max mean expression
E-ANND-3no0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

15 targeting CYB5R2, top 30 by miRDB confidence (max_score; target_count = how many genes the miRNA targets in total — lower means more specific):

miRNAMax scoreAvg scoremiRNA target_count
HSA-MIR-6512-3P99.6566.071468
HSA-MIR-6720-5P99.6566.221459
HSA-MIR-466399.6265.33957
HSA-MIR-6832-3P99.5270.441726
HSA-MIR-568399.3668.592083
HSA-MIR-146A-3P99.1368.991881
HSA-MIR-129-1-3P98.8668.41779
HSA-MIR-129-2-3P98.8668.41779
HSA-MIR-589-5P98.7266.96927
HSA-MIR-302F98.4469.021776
HSA-MIR-1245B-3P98.0168.911387
HSA-MIR-447597.3666.95761
HSA-MIR-6849-3P97.2564.571371
HSA-MIR-4714-5P97.0467.76955
HSA-MIR-1233-3P96.8165.44573

Literature-anchored findings (GeneRIF, showing 6)

  • CYB5R2 is a key enzyme involved in the mediation of NADH-induced redox activity in human spermatozoa. (PMID:15858218)
  • findings suggest that CYB5R2 may be a functional tumor suppressor gene, frequently inactivated by hypermethylation of its promoter in nasopharyngeal carcinoma (PMID:24338690)
  • Study showed that multifocal or multicentric glioblastomas have some underlying genetic and epigenetic characteristics that are associated with poor prognosis and that CYB5R2 is a new epigenetic marker for glioblastoma prognosis (PMID:26323991)
  • Intratumoral Heterogeneity for Inactivating Frameshift Mutation of CYB5R2 Gene in Colorectal Cancers. (PMID:29532410)
  • Long non-coding RNA MEG3 inhibits neovascularization in diabetic retinopathy by regulating microRNA miR-6720-5p and cytochrome B5 reductase 2. (PMID:34978518)
  • NADH-Cytochrome B5 reductase 2 suppresses retinal vascular dysfunction through regulation of vascular endothelial growth factor A in diabetic retinopathy. (PMID:35820466)

Cross-species orthologs

6 orthologs

OrganismSymbolGene ID
danio_reriocyb5r2ENSDARG00000051925
mus_musculusCyb5r2ENSMUSG00000048065
rattus_norvegicusCyb5r2ENSRNOG00000019751
drosophila_melanogasterCG5946FBGN0036211
caenorhabditis_elegansWBGENE00020267
caenorhabditis_elegansWBGENE00020268

Paralogs (5): CYB5R4 (ENSG00000065615), CYB5R3 (ENSG00000100243), OXNAD1 (ENSG00000154814), CYB5R1 (ENSG00000159348), CYB5RL (ENSG00000215883)

Protein

Protein identifiers

NADH-cytochrome b5 reductase 2Q6BCY4 (reviewed: Q6BCY4)

All UniProt accessions (5): E9PIV9, E9PMI2, E9PQW2, E9PRM4, Q6BCY4

UniProt curated annotations — full annotation on UniProt →

Function. NADH-cytochrome b5 reductases are involved in desaturation and elongation of fatty acids, cholesterol biosynthesis, drug metabolism, and, in erythrocyte, methemoglobin reduction. Responsible for NADH-dependent lucigenin chemiluminescence in spermatozoa by reducing both lucigenin and 2-[4-iodophenyl]-3-[4-nitrophenyl]-5-[2,4-disulfophenyl]-2H tetrazolium monosodium salt (WST-1).

Tissue specificity. Restricted expression.

Similarity. Belongs to the flavoprotein pyridine nucleotide cytochrome reductase family.

Isoforms (2)

UniProt IDNamesCanonical?
Q6BCY4-11yes
Q6BCY4-22

RefSeq proteins (3): NP_001289755, NP_001289756, NP_057313* (*=MANE)

Domains & families (InterPro)

IDNameType
IPR001433OxRdtase_FAD/NAD-bdDomain
IPR001709Flavoprot_Pyr_Nucl_cyt_RdtaseDomain
IPR001834CBR-likeFamily
IPR008333Cbr1-like_FAD-bd_domDomain
IPR017927FAD-bd_FR_typeDomain
IPR017938Riboflavin_synthase-like_b-brlHomologous_superfamily
IPR039261FNR_nucleotide-bdHomologous_superfamily

Pfam: PF00175, PF00970

Enzyme classification (BRENDA):

  • EC 1.6.2.2 — cytochrome-b5 reductase (BRENDA: 34 organisms, 101 substrates, 111 inhibitors, 300 Km, 221 kcat entries)

Substrate kinetics (BRENDA)

23 substrates with measured Km, best-characterized 15. Km ranges are aggregated across organisms/conditions.

SubstrateKm (mM)Measurements
NADH0.0002–3.3294
FERRICYANIDE0.0006–4.3572
FERRICYTOCHROME B566
CYTOCHROME B50.0011–0.04219
NADPH0.001–7.6917
FERROCYTOCHROME B50.001–0.1076
FERRICYTOCHOME B50.01–0.0134
FERRICYTOCHROME C0.0003–0.0073
OXIDIZED 2,6-DICHLOROPHENOLINDOPHENOL0.328–0.832
1,4-NAPHTHOQUINONE0.00981
2-HYDROXYESTRADIOL0.00261
2-METHYL-1,4-NAPHTHOQUINONE0.0771
9,10-PHENANTHRENEQUINONE0.00571
AQUACOBALAMIN0.04191
BENZAMIDOXIME0.631

Catalyzed reactions (Rhea), 1 shown:

  • 2 Fe(III)-[cytochrome b5] + NADH = 2 Fe(II)-[cytochrome b5] + NAD(+) + H(+) (RHEA:46680)

UniProt features (11 total): sequence conflict 2, binding site 2, modified residue 2, sequence variant 2, chain 1, domain 1, splice variant 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q6BCY4-F195.730.95

Functional residue map

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

Ligand- & substrate-binding residues (2): 107–137; 146–181

Post-translational modifications (2): 17, 18

Function

Pathways and Gene Ontology

Reactome pathways

3 pathways

IDPathway
R-HSA-1237044Erythrocytes take up carbon dioxide and release oxygen
R-HSA-1480926O2/CO2 exchange in erythrocytes
R-HSA-382551Transport of small molecules

MSigDB gene sets: 99 (showing top): ONDER_CDH1_TARGETS_3_DN, YORDY_RECIPROCAL_REGULATION_BY_ETS1_AND_SP100_DN, YANG_BREAST_CANCER_ESR1_DN, GOBP_STEROID_BIOSYNTHETIC_PROCESS, GOBP_ORGANIC_ANION_TRANSPORT, GOBP_BICARBONATE_TRANSPORT, GOBP_LIPID_METABOLIC_PROCESS, TURASHVILI_BREAST_DUCTAL_CARCINOMA_VS_DUCTAL_NORMAL_DN, GOBP_LIPID_BIOSYNTHETIC_PROCESS, SENESE_HDAC1_TARGETS_UP, GOMF_OXIDOREDUCTASE_ACTIVITY_ACTING_ON_NAD_P_H, GOBP_STEROL_BIOSYNTHETIC_PROCESS, VANTVEER_BREAST_CANCER_ESR1_DN, GOBP_STEROID_METABOLIC_PROCESS, GOCC_NUCLEAR_OUTER_MEMBRANE_ENDOPLASMIC_RETICULUM_MEMBRANE_NETWORK

GO Biological Process (5): bicarbonate transport (GO:0015701), sterol biosynthetic process (GO:0016126), lipid metabolic process (GO:0006629), steroid biosynthetic process (GO:0006694), steroid metabolic process (GO:0008202)

GO Molecular Function (5): cytochrome-b5 reductase activity, acting on NAD(P)H (GO:0004128), FAD binding (GO:0071949), cytochrome-b5 reductase activity, acting on NADH (GO:0090524), protein binding (GO:0005515), oxidoreductase activity (GO:0016491)

GO Cellular Component (4): nucleus (GO:0005634), mitochondrion (GO:0005739), endoplasmic reticulum membrane (GO:0005789), membrane (GO:0016020)

Reactome top-level categories

Rollup of top-2 pathways:

CategoryPathways
O2/CO2 exchange in erythrocytes1
Transport of small molecules1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
intracellular membrane-bounded organelle2
transport1
steroid biosynthetic process1
sterol metabolic process1
primary metabolic process1
steroid metabolic process1
lipid biosynthetic process1
lipid metabolic process1
oxidoreductase activity, acting on NAD(P)H, heme protein as acceptor1
flavin adenine dinucleotide binding1
cytochrome-b5 reductase activity, acting on NAD(P)H1
binding1
catalytic activity1
cytoplasm1
organelle membrane1
nuclear outer membrane-endoplasmic reticulum membrane network1
endoplasmic reticulum subcompartment1
cellular anatomical structure1

Protein interactions and networks

STRING

1272 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
CYB5R2CYB5BO43169993
CYB5R2CYB5AP00167992
CYB5R2SCDO00767818
CYB5R2PORP16435612
CYB5R2CYP51A1Q16850581
CYB5R2DHODHQ02127502
CYB5R2SUOXP51687470
CYB5R2ZNF614Q8N883462
CYB5R2CCNYL1Q8N7R7433
CYB5R2CLRN3Q8NCR9425
CYB5R2TNFRSF13BO14836418
CYB5R2NQO1P15559418
CYB5R2ZPBP2Q6X784412
CYB5R2TUBG2Q9NRH3410
CYB5R2CYP27C1Q4G0S4410

IntAct

29 interactions, top by confidence:

ABTypeScore
CYB5R2TRIP13psi-mi:“MI:0915”(physical association)0.670
TRIP13CYB5R2psi-mi:“MI:0915”(physical association)0.670
PSMC6CYB5R2psi-mi:“MI:0915”(physical association)0.560
GOLGA2CYB5R2psi-mi:“MI:0915”(physical association)0.560
CYB5R2TRAF2psi-mi:“MI:0915”(physical association)0.560
CYB5R2TRAF1psi-mi:“MI:0915”(physical association)0.560
CYB5R2CDC23psi-mi:“MI:0915”(physical association)0.560
TRAF2CYB5R2psi-mi:“MI:0915”(physical association)0.560
CDC23CYB5R2psi-mi:“MI:0915”(physical association)0.560
CYB5R2GOLGA2psi-mi:“MI:0915”(physical association)0.560
TRAF1CYB5R2psi-mi:“MI:0915”(physical association)0.560
FFAR2CYB5R2psi-mi:“MI:0915”(physical association)0.370
OR2A4A2ML1psi-mi:“MI:0914”(association)0.350
CCR1UBA6psi-mi:“MI:0914”(association)0.350
PINK1A2ML1psi-mi:“MI:0914”(association)0.350
AGPAT1A2ML1psi-mi:“MI:0914”(association)0.350
SARAFA2ML1psi-mi:“MI:0914”(association)0.350
MYCBPA2ML1psi-mi:“MI:0914”(association)0.350
SMPD2A2ML1psi-mi:“MI:0914”(association)0.350
CYB5R2COILpsi-mi:“MI:0915”(physical association)0.000

BioGRID (34): CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid), CYB5R2 (Two-hybrid)

ESM2 similar proteins: A1C7E9, A1DHW1, A2QCV4, A4R935, A5DQ25, A6R2K7, A6ZVM6, O74557, P00387, P04175, P07514, P0CP14, P0CP15, P16435, P19618, P20070, P37039, P38626, P83686, Q07994, Q0CY37, Q0P487, Q0UEY4, Q0X0E5, Q1DWN4, Q27597, Q2UFN3, Q3KNK3, Q3SYT8, Q4PGW7, Q4X0B5, Q54NC1, Q59P03, Q5AZB4, Q5BJ68, Q5EB81, Q5PQA4, Q5ZHX7, Q60HG4, Q6AY12

Diamond homologs: A0A286R227, A1C7E9, A1DHW1, A2QCV4, A3GF86, A3LT66, A4QR21, A4R935, A5DQ25, A5E7U2, A6R2K7, A6ZVM6, A7TNL7, B0CQN7, O74557, P00387, P07514, P07850, P08509, P08619, P0CP14, P0CP15, P11035, P11605, P11832, P16081, P17569, P17570, P17571, P20070, P22945, P23312, P27783, P27967, P27968, P27969, P36841, P36842, P36858, P36859

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance62
Likely benign2
Benign1

Top pathogenic / likely-pathogenic (0)

SpliceAI

1495 predictions. Top by Δscore:

VariantEffectΔscore
11:7668643:C:CAdonor_gain1.0000
11:7669620:TTTA:Tdonor_loss1.0000
11:7669621:TTAC:Tdonor_loss1.0000
11:7669622:TAC:Tdonor_loss1.0000
11:7669623:AC:Adonor_loss1.0000
11:7672445:GCTCA:Gdonor_loss1.0000
11:7672446:CTCA:Cdonor_loss1.0000
11:7672447:TCA:Tdonor_loss1.0000
11:7672448:CACCT:Cdonor_loss1.0000
11:7672449:A:Cdonor_loss1.0000
11:7672450:C:Tdonor_loss1.0000
11:7672744:TTAC:Tdonor_loss1.0000
11:7672745:TACCT:Tdonor_loss1.0000
11:7672746:ACC:Adonor_loss1.0000
11:7672747:C:Adonor_loss1.0000
11:7672747:CCT:Cdonor_gain1.0000
11:7672749:T:TAdonor_gain1.0000
11:7665542:CCAGC:Cacceptor_gain0.9900
11:7665543:CAGC:Cacceptor_gain0.9900
11:7665543:CAGCC:Cacceptor_gain0.9900
11:7665545:GCCTG:Gacceptor_loss0.9900
11:7665546:CCTGA:Cacceptor_loss0.9900
11:7665547:C:CCacceptor_gain0.9900
11:7665547:C:CGacceptor_loss0.9900
11:7665548:T:Aacceptor_loss0.9900
11:7666547:CTGT:Cacceptor_gain0.9900
11:7667723:CTGA:Cdonor_loss0.9900
11:7667724:TGACC:Tdonor_loss0.9900
11:7667725:GACC:Gdonor_loss0.9900
11:7667727:C:CAdonor_loss0.9900

AlphaMissense

1826 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
11:7672498:A:GF35S0.989
11:7669285:G:AT103I0.987
11:7672495:C:GR36P0.986
11:7669635:A:GL83P0.984
11:7672504:C:GR33P0.984
11:7665544:A:GW221R0.983
11:7665544:A:TW221R0.983
11:7669625:C:AK86N0.983
11:7669625:C:GK86N0.983
11:7667744:A:GL181P0.982
11:7669238:C:GG119R0.982
11:7669238:C:TG119R0.982
11:7665456:C:TG250D0.981
11:7665522:A:TV228D0.981
11:7669627:T:CK86E0.981
11:7669237:C:TG119E0.980
11:7669722:A:TV54D0.980
11:7667813:C:TG158D0.979
11:7669671:G:TP71H0.979
11:7669629:A:TI85K0.978
11:7672761:A:GL22S0.978
11:7668489:G:TA154D0.977
11:7672491:A:CF37L0.977
11:7672491:A:TF37L0.977
11:7672493:A:GF37L0.977
11:7669276:A:GL106S0.975
11:7669682:C:AR67S0.975
11:7669682:C:GR67S0.975
11:7672515:G:CS29R0.974
11:7672515:G:TS29R0.974

dbSNP variants (sampled 300 via entrez): RS1000015876 (11:7674105 A>G,T), RS1000409569 (11:7666709 C>A,G), RS1000913302 (11:7674638 G>A), RS1000963864 (11:7674962 T>C), RS1001128291 (11:7670785 G>A), RS1001310805 (11:7672189 T>G), RS1001356570 (11:7671969 G>A,C), RS1001408757 (11:7671836 C>T), RS1001476393 (11:7670628 T>C), RS1001638909 (11:7666759 A>C), RS1002079184 (11:7665905 G>T), RS1002382500 (11:7668237 C>G,T), RS1002475156 (11:7674554 T>G), RS1002516141 (11:7668241 G>C,T), RS1003033322 (11:7673079 G>T)

Disease associations

OMIM: gene MIM:608342 | disease phenotypes:

GenCC curated gene-disease

Mondo (0):

Orphanet (0):

HPO phenotypes

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

GWAS associations

5 associations (top):

StudyTraitp-value
GCST002143_7Blood pressure6.000000e-06
GCST009391_103Metabolite levels6.000000e-06
GCST010725_20Malaria4.000000e-69
GCST010725_33Malaria2.000000e-67
GCST010725_51Malaria1.000000e-55

EFO canonical traits (2, from GWAS)

EFO IDTrait name
EFO:0006335systolic blood pressure
EFO:0009767glycine measurement

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

43 total (human), top 30 by PubMed support.

ChemicalActions (top 5)PubMed papers
Tetrachlorodibenzodioxinincreases expression, affects expression3
Benzo(a)pyreneincreases methylation, increases expression2
Smokedecreases expression, decreases reaction2
Tobacco Smoke Pollutionaffects expression, increases expression2
Tretinoinincreases expression2
Particulate Matterincreases expression, affects methylation, increases abundance2
methylmercuric chloridedecreases expression1
propionaldehydeincreases expression1
pirinixic aciddecreases expression, increases activity, affects binding1
bisphenol Adecreases methylation1
decabromobiphenyl etherdecreases expression1
2-methyl-4-isothiazolin-3-oneincreases expression1
sodium arseniteincreases expression1
butyraldehydeincreases expression1
cupric oxideincreases expression1
pentanalincreases expression1
ICG 001increases expression1
mirdametinibdecreases expression, affects cotreatment1
2,2’,4,4’-tetrabromodiphenyl etherdecreases expression1
pentabrominated diphenyl ether 100decreases expression1
hexabrominated diphenyl ether 153decreases expression1
MRK 003decreases expression1
(+)-JQ1 compoundaffects cotreatment, decreases expression1
Resveratrolincreases expression1
Temozolomideincreases expression1
Decitabinedecreases expression, decreases reaction1
Sunitinibdecreases expression1
Arsenic Trioxidedecreases expression1
Fulvestrantincreases methylation1
Air Pollutantsaffects methylation, increases abundance1

Clinical trials (associated diseases)

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

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