EXTL2

gene
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Summary

EXTL2 (exostosin like glycosyltransferase 2, HGNC:3516) is a protein-coding gene on chromosome 1p21.2, encoding Exostosin-like 2 (Q9UBQ6). Glycosyltransferase required for the biosynthesis of heparan-sulfate and responsible for the alternating addition of beta-1-4-linked glucuronic acid (GlcA) and alpha-1-4-linked N-acetylglucosamine (GlcNAc) units to nascent heparan sulfate chains.

Enables alpha-1,4-N-acetylgalactosaminyltransferase activity and glucuronyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase activity. Involved in N-acetylglucosamine metabolic process and UDP-N-acetylgalactosamine metabolic process. Located in cytosol; endoplasmic reticulum; and nucleoplasm.

Source: NCBI Gene 2135 — RefSeq curated summary.

At a glance

  • GWAS associations: 2
  • Clinical variants (ClinVar): 39 total
  • MANE Select transcript: NM_001033025

Identifiers

Gene identifiers

FieldValue
HGNC IDHGNC:3516
Approved symbolEXTL2
Nameexostosin like glycosyltransferase 2
Location1p21.2
Locus typegene with protein product
StatusApproved
Ensembl geneENSG00000162694
Ensembl biotypeprotein_coding
OMIM602411
Entrez2135

Gene structure

Transcript identifiers

Ensembl transcripts: 19 — 17 protein_coding, 2 protein_coding_CDS_not_defined

ENST00000370113, ENST00000370114, ENST00000416479, ENST00000450240, ENST00000480774, ENST00000494907, ENST00000535414, ENST00000886538, ENST00000886539, ENST00000886540, ENST00000886541, ENST00000886542, ENST00000886544, ENST00000886545, ENST00000886546, ENST00000886547, ENST00000939947, ENST00000939948, ENST00000939949

RefSeq mRNA: 5 — MANE Select: NM_001033025 NM_001033025, NM_001261440, NM_001261441, NM_001261442, NM_001439

CCDS: CCDS72831, CCDS775

Canonical transcript exons

ENST00000370114 — 5 exons

ExonStartEnd
ENSE00001067761100876794100876864
ENSE00001067762100894633100894842
ENSE00003641584100888753100888828
ENSE00003717947100877476100877903
ENSE00003848257100872391100874430

Expression profiles

Bgee: expression breadth ubiquitous, 277 present calls, max score 97.45.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 14.8832 / max 250.4997, expressed in 1622 samples.

FANTOM5 promoters (5 alternative TSS)

Promoter IDTPM avgSamples expressed
135308.94861476
135293.75361238
135311.1344643
135270.7798444
135280.2668116

Top tissues by expression

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

TissueAnatomy IDExpression scoreQuality
adrenal tissueUBERON:001830397.45gold quality
periodontal ligamentUBERON:000826692.93gold quality
postcentral gyrusUBERON:000258192.07gold quality
Brodmann (1909) area 46UBERON:000648391.80gold quality
lateral nuclear group of thalamusUBERON:000273691.77gold quality
ventricular zoneUBERON:000305390.70gold quality
right adrenal gland cortexUBERON:003582790.68gold quality
right adrenal glandUBERON:000123390.40gold quality
parietal lobeUBERON:000187290.10gold quality
superior frontal gyrusUBERON:000266189.98gold quality
left adrenal glandUBERON:000123489.85gold quality
left adrenal gland cortexUBERON:003582589.74gold quality
stromal cell of endometriumCL:000225589.71gold quality
adrenal cortexUBERON:000123589.63gold quality
Brodmann (1909) area 10UBERON:001354189.50gold quality
adrenal glandUBERON:000236989.48gold quality
embryoUBERON:000092289.26gold quality
placentaUBERON:000198789.15gold quality
orbitofrontal cortexUBERON:000416788.89gold quality
prefrontal cortexUBERON:000045188.85gold quality
choroid plexus epitheliumUBERON:000391188.52gold quality
right uterine tubeUBERON:000130288.24gold quality
Brodmann (1909) area 9UBERON:001354088.24gold quality
tibiaUBERON:000097988.21gold quality
dorsolateral prefrontal cortexUBERON:000983488.17gold quality
caudate nucleusUBERON:000187388.16gold quality
ganglionic eminenceUBERON:000402388.16gold quality
primary visual cortexUBERON:000243688.04gold quality
frontal cortexUBERON:000187087.75gold quality
cortical plateUBERON:000534387.66gold quality

Single-cell (SCXA)

Detected in 3 experiment(s), a significant marker in 2.

ExperimentMarker?Max mean expression
E-MTAB-6701yes121.83
E-ANND-3yes8.64
E-MTAB-6524no136.04

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

92 targeting EXTL2, 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-30A-5P100.0076.313233
HSA-MIR-30B-5P100.0076.293248
HSA-MIR-30C-5P100.0076.293248
HSA-MIR-30D-5P100.0076.323233
HSA-MIR-30E-5P100.0076.323242
HSA-MIR-1193100.0065.93529
HSA-MIR-12118100.0065.881270
HSA-MIR-4789-3P99.9970.752484
HSA-MIR-4482-3P99.9872.503147
HSA-MIR-6891-5P99.9866.531372
HSA-MIR-806899.9873.852376
HSA-MIR-433-3P99.9869.371203
HSA-MIR-3173-3P99.9866.491217
HSA-MIR-60799.9773.625593
HSA-MIR-548AA99.9670.643753
HSA-MIR-548AP-3P99.9670.643753
HSA-MIR-548T-3P99.9670.643753
HSA-MIR-568899.9673.234504
HSA-MIR-495-3P99.9672.814197
HSA-MIR-311999.9271.342390
HSA-MIR-7-1-3P99.9171.534384
HSA-MIR-7-2-3P99.9171.404394
HSA-MIR-808799.9069.551351
HSA-MIR-153-5P99.8973.866317
HSA-MIR-30A-3P99.8769.742928
HSA-MIR-30D-3P99.8769.922917
HSA-MIR-30E-3P99.8769.682942
HSA-MIR-76599.8468.242442
HSA-MIR-449599.8272.083080
HSA-MIR-684499.8270.692423

Literature-anchored findings (GeneRIF, showing 6)

  • donor binding appears to undergo two distinct steps, beginning with the N-acetyl group expelling water from the donor- enzyme complex into the bulk solvent followed by positioning of the donor into the binding site for interactions with the enzyme (PMID:15831490)
  • Lysosomal glycosaminoglycan levels in mucopolysaccharidosis are reduced by EXTL2 gene silencing. (PMID:19690583)
  • EXTL2 functions to suppress GAG biosynthesis that is enhanced by a xylose kinase and the EXTL2-dependent mechanism that regulates GAG biosynthesis might be a “quality control system” for proteoglycans (PMID:23395820)
  • Altered Expression of Aggrecan, FAM20B, B3GALT6, and EXTL2 in Patients with Osteoarthritis and Kashin-Beck Disease. (PMID:32517548)
  • The glycosyltransferase EXTL2 promotes proteoglycan deposition and injurious neuroinflammation following demyelination. (PMID:32703234)
  • Glycosyltransferases EXTL2 and EXTL3 cellular balance dictates heparan sulfate biosynthesis and shapes gastric cancer cell motility and invasion. (PMID:36181793)

Cross-species orthologs

3 orthologs

OrganismSymbolGene ID
danio_rerioextl2ENSDARG00000063191
mus_musculusExtl2ENSMUSG00000027963
rattus_norvegicusExtl2ENSRNOG00000014323

Paralogs (4): EXTL3 (ENSG00000012232), EXT2 (ENSG00000151348), EXTL1 (ENSG00000158008), EXT1 (ENSG00000182197)

Protein

Protein identifiers

Exostosin-like 2Q9UBQ6 (reviewed: Q9UBQ6)

Alternative names: Alpha-1,4-N-acetylhexosaminyltransferase EXTL2, Alpha-GalNAcT EXTL2, EXT-related protein 2, Glucuronyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase

All UniProt accessions (5): C9IYF5, C9JEG3, Q9UBQ6, F5GZK1, Q8N8F1

UniProt curated annotations — full annotation on UniProt →

Function. Glycosyltransferase required for the biosynthesis of heparan-sulfate and responsible for the alternating addition of beta-1-4-linked glucuronic acid (GlcA) and alpha-1-4-linked N-acetylglucosamine (GlcNAc) units to nascent heparan sulfate chains.

Subcellular location. Endoplasmic reticulum membrane Secreted.

Tissue specificity. Ubiquitous.

Post-translational modifications. The soluble form derives from the membrane form by proteolytic processing.

Pathway. Glycan metabolism; heparan sulfate biosynthesis.

Similarity. Belongs to the glycosyltransferase 47 family.

RefSeq proteins (5): NP_001028197, NP_001248369, NP_001248370, NP_001248371, NP_001430 (=MANE)

Domains & families (InterPro)

IDNameType
IPR015338GT64_domDomain
IPR029044Nucleotide-diphossugar_transHomologous_superfamily
IPR052427Glycosyltrans_GT2/GT47Family

Pfam: PF09258

Enzyme classification (BRENDA):

  • EC 2.4.1.223 — glucuronosyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase (BRENDA: 5 organisms, 17 substrates, 1 inhibitors, 0 Km, 0 kcat entries)

Catalyzed reactions (Rhea), 1 shown:

  • 3-O-(beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-seryl-[protein] + UDP-N-acetyl-alpha-D-glucosamine = 3-O-(alpha-D-GlcNAc-(1->4)-beta-D-GlcA-(1->3)-beta-D-Gal-(1->3)-beta-D-Gal-(1->4)-beta-D-Xyl)-L-seryl-[protein] + UDP + H(+) (RHEA:16221)

UniProt features (31 total): binding site 22, chain 2, topological domain 2, site 1, glycosylation site 1, transmembrane region 1, disulfide bond 1, active site 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

ModelpLDDTFraction very-high
AF-Q9UBQ6-F189.050.72

Functional residue map

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

Catalytic / active sites (2): 53–54 (cleavage); 245

Ligand- & substrate-binding residues (22): 100; 100; 129; 129; 134; 134; 150; 150; 151; 151; 152; 152

Disulfide bonds (1): 243–296

Glycosylation sites (1): 74

Function

Pathways and Gene Ontology

Reactome pathways

2 pathways

IDPathway
R-HSA-2022928HS-GAG biosynthesis
R-HSA-381038XBP1(S) activates chaperone genes

MSigDB gene sets: 225 (showing top): WAMUNYOKOLI_OVARIAN_CANCER_LMP_DN, REACTOME_UNFOLDED_PROTEIN_RESPONSE_UPR, BUYTAERT_PHOTODYNAMIC_THERAPY_STRESS_DN, BERTUCCI_MEDULLARY_VS_DUCTAL_BREAST_CANCER_DN, RORA1_01, AAGCCAT_MIR135A_MIR135B, GEORGES_CELL_CYCLE_MIR192_TARGETS, GOBP_ORGANOPHOSPHATE_METABOLIC_PROCESS, TGACCTY_ERR1_Q2, BILD_SRC_ONCOGENIC_SIGNATURE, GOBP_CARBOHYDRATE_DERIVATIVE_METABOLIC_PROCESS, GOBP_NUCLEOBASE_CONTAINING_SMALL_MOLECULE_METABOLIC_PROCESS, MODULE_205, BRN2_01, GOBP_HEPARAN_SULFATE_PROTEOGLYCAN_METABOLIC_PROCESS

GO Biological Process (4): N-acetylglucosamine metabolic process (GO:0006044), heparan sulfate proteoglycan biosynthetic process (GO:0015012), UDP-N-acetylgalactosamine metabolic process (GO:0019276), carbohydrate derivative metabolic process (GO:1901135)

GO Molecular Function (10): glucuronyl-galactosyl-proteoglycan 4-alpha-N-acetylglucosaminyltransferase activity (GO:0001888), glycosaminoglycan binding (GO:0005539), manganese ion binding (GO:0030145), alpha-1,4-N-acetylgalactosaminyltransferase activity (GO:0035248), glucuronylgalactosylproteoglycan 4-beta-N-acetylgalactosaminyltransferase activity (GO:0047237), protein binding (GO:0005515), acetylglucosaminyltransferase activity (GO:0008375), transferase activity (GO:0016740), glycosyltransferase activity (GO:0016757), metal ion binding (GO:0046872)

GO Cellular Component (7): Golgi membrane (GO:0000139), extracellular region (GO:0005576), nucleoplasm (GO:0005654), endoplasmic reticulum (GO:0005783), endoplasmic reticulum membrane (GO:0005789), cytosol (GO:0005829), membrane (GO:0016020)

Reactome top-level categories

Rollup of top-2 pathways:

CategoryPathways
Heparan sulfate/heparin (HS-GAG) metabolism1
IRE1alpha activates chaperones1

GO top-level categories

Rollup of top GO terms by namespace:

CategoryTerms
cellular anatomical structure4
amino sugar metabolic process2
acetylgalactosaminyltransferase activity2
cytoplasm2
proteoglycan biosynthetic process1
heparan sulfate proteoglycan metabolic process1
protein O-linked glycosylation via xylose1
nucleotide-sugar metabolic process1
metabolic process1
acetylglucosaminyltransferase activity1
carbohydrate derivative binding1
transition metal ion binding1
binding1
UDP-glycosyltransferase activity1
hexosyltransferase activity1
catalytic activity1
transferase activity1
cation binding1
Golgi apparatus1
bounding membrane of organelle1
nuclear lumen1
endomembrane system1
intracellular membrane-bounded organelle1
organelle membrane1
nuclear outer membrane-endoplasmic reticulum membrane network1
endoplasmic reticulum subcompartment1

Protein interactions and networks

STRING

590 interactions, top by confidence (×1000):

Protein AProtein BPartner UniProtScore
EXTL2FAM20BO75063702
EXTL2XYLT1Q86Y38669
EXTL2XYLT2Q9H1B5653
EXTL2EXT1Q16394642
EXTL2B4GALT7Q9UBV7622
EXTL2HS2ST1Q7LGA3613
EXTL2CSGALNACT1Q8TDX6598
EXTL2B3GALT6Q96L58596
EXTL2B3GAT3O94766593
EXTL2CSGALNACT2Q8N6G5582
EXTL2PXYLP1Q8TE99578
EXTL2CCDC188H7C350578
EXTL2NDST2P52849577
EXTL2NDST1P52848569
EXTL2GLCEO94923569

IntAct

88 interactions, top by confidence:

ABTypeScore
TRDNTMEM223psi-mi:“MI:0914”(association)0.640
EXTL2GFAPpsi-mi:“MI:0915”(physical association)0.560
EXTL2JPH3psi-mi:“MI:0915”(physical association)0.560
EXTL2SPRED1psi-mi:“MI:0915”(physical association)0.560
EXTL2psi-mi:“MI:0915”(physical association)0.550
SLC39A5TMEM223psi-mi:“MI:0914”(association)0.530
IPPKTMEM223psi-mi:“MI:0914”(association)0.530
MGAT4CGXYLT2psi-mi:“MI:0914”(association)0.530
KCNA10GAPDHSpsi-mi:“MI:0914”(association)0.530
SPPL2BUQCRQpsi-mi:“MI:0914”(association)0.530
SCN3BABCC5psi-mi:“MI:0914”(association)0.530
AOC3AOC2psi-mi:“MI:0914”(association)0.530
LPAR1TMEM120Bpsi-mi:“MI:0914”(association)0.530
CSGALNACT2GOLIM4psi-mi:“MI:0914”(association)0.530
SLC39A4TMEM120Bpsi-mi:“MI:0914”(association)0.530
CHRNA4FZD6psi-mi:“MI:0914”(association)0.530
CSGALNACT2TPST1psi-mi:“MI:0914”(association)0.530
GJC1EXTL2psi-mi:“MI:0915”(physical association)0.400
GPC1SNAP23psi-mi:“MI:0915”(physical association)0.400

BioGRID (70): EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS), EXTL2 (Affinity Capture-MS)

ESM2 similar proteins: A0A1S6M251, A8Y1P7, H0ZAB5, L7YAI7, O43286, O43505, O60513, O60909, O61394, O61397, O88419, P08037, P15291, P15535, P34548, P34678, P70419, Q09323, Q09363, Q14435, Q3YL68, Q5EA01, Q5EA87, Q5QQ54, Q5QQ55, Q5R4S2, Q66HH1, Q6P768, Q6WV17, Q6WV20, Q7K755, Q80WN7, Q80WN8, Q80WN9, Q8BWP8, Q8I136, Q8IA42, Q8MV48, Q8MVS5, Q91YY2

Diamond homologs: A5D7I4, A9X1C8, O01704, O77783, P70428, P97464, Q16394, Q33AH8, Q5IGR6, Q5IGR7, Q5IGR8, Q5RBC3, Q84WB7, Q92935, Q93063, Q9C975, Q9ES89, Q9JK82, Q9JKV7, Q9LY62, Q9SSE8, Q9UBQ6, Q9V730, Q9XZ08, Q9Y169, A2Y6Z7, O01705, O43909, Q3E9A4, Q3EAR7, Q53WK1, Q94AA9, Q9WVL6, Q6NMM8, A9RGD8, Q6H4N0, Q7XLG3, Q8S1X7, Q8S1X8, Q8S1X9

SIGNOR signaling

0 interactions.

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

ClassificationCount (floor)
Pathogenic0
Likely pathogenic0
Uncertain significance30
Likely benign4
Benign0

Top pathogenic / likely-pathogenic (0)

SpliceAI

1197 predictions. Top by Δscore:

VariantEffectΔscore
1:100874428:TTG:Tacceptor_gain1.0000
1:100874429:TG:Tacceptor_gain1.0000
1:100874431:C:CCacceptor_gain1.0000
1:100876860:CACTG:Cacceptor_gain1.0000
1:100876862:CTG:Cacceptor_gain1.0000
1:100888884:T:Cacceptor_gain1.0000
1:100874426:AATTG:Aacceptor_gain0.9900
1:100874429:TGCTG:Tacceptor_loss0.9900
1:100874430:GCTG:Gacceptor_loss0.9900
1:100874431:CT:Cacceptor_loss0.9900
1:100876865:C:CCacceptor_gain0.9900
1:100888829:C:CCacceptor_gain0.9900
1:100888884:T:TCacceptor_gain0.9900
1:100894627:CCTTA:Cdonor_loss0.9900
1:100894628:CTTAC:Cdonor_loss0.9900
1:100894629:TTA:Tdonor_loss0.9900
1:100894630:TA:Tdonor_loss0.9900
1:100894631:A:Tdonor_loss0.9900
1:100894632:C:CGdonor_loss0.9900
1:100874427:ATTG:Aacceptor_gain0.9800
1:100876188:T:Cacceptor_gain0.9800
1:100876863:TG:Tacceptor_gain0.9800
1:100877732:G:Adonor_gain0.9800
1:100877909:G:GCacceptor_gain0.9800
1:100889497:A:Cdonor_gain0.9800
1:100891568:T:TAdonor_gain0.9800
1:100875847:T:TAdonor_gain0.9700
1:100876788:CATT:Cdonor_loss0.9700
1:100876789:ATTA:Adonor_loss0.9700
1:100876790:TTAC:Tdonor_loss0.9700

AlphaMissense

2194 scored. Top likely-pathogenic:

VariantProtein changeam_pathogenicity
1:100876849:T:AD150V0.998
1:100874047:A:CC296W0.997
1:100874206:A:CC243W0.997
1:100874408:C:TG176E0.997
1:100877614:A:GW99R0.997
1:100877614:A:TW99R0.997
1:100874201:T:AD245V0.996
1:100877685:C:GR75T0.996
1:100874048:C:TC296Y0.995
1:100874207:C:TC243Y0.995
1:100877684:T:AR75S0.995
1:100877684:T:GR75S0.995
1:100877685:C:AR75I0.995
1:100874036:A:GL300P0.994
1:100874056:C:AR293S0.994
1:100874056:C:GR293S0.994
1:100874057:C:GR293T0.994
1:100874188:A:CN249K0.994
1:100874188:A:TN249K0.994
1:100874201:T:GD245A0.994
1:100874208:A:GC243R0.994
1:100874209:G:CN242K0.994
1:100874209:G:TN242K0.994
1:100874309:G:AS209F0.994
1:100876847:C:GD151H0.994
1:100877609:G:CN100K0.994
1:100877609:G:TN100K0.994
1:100877619:A:TV97E0.994
1:100874048:C:GC296S0.993
1:100874049:A:GC296R0.993

dbSNP variants (sampled 300 via entrez): RS1000057002 (1:100872452 A>T), RS1000065415 (1:100896758 A>G), RS1000095794 (1:100877000 G>C), RS1000115193 (1:100876671 C>T), RS1000890729 (1:100890305 G>C), RS1000940768 (1:100890691 T>C), RS1000961585 (1:100884173 C>T), RS1001020858 (1:100896135 T>C,G), RS1001348364 (1:100890831 A>G), RS1002039319 (1:100894787 C>G,T), RS1002242561 (1:100888311 T>A), RS1002259620 (1:100881880 C>A), RS1002445194 (1:100878664 G>A), RS1002507816 (1:100872135 T>C), RS1002839559 (1:100875338 G>C)

Disease associations

OMIM: gene MIM:602411 | 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):

StudyTraitp-value
GCST001198_20Multiple sclerosis4.000000e-08
GCST001198_77Multiple sclerosis4.000000e-08

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

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

ChemicalActions (top 5)PubMed papers
Valproic Acidaffects expression, decreases methylation, increases expression2
Cyclosporinedecreases expression2
Aflatoxin B1decreases methylation, increases expression2
ginger extractincreases expression, decreases reaction, increases abundance1
dicrotophosdecreases expression1
triphenyl phosphateaffects expression1
bisphenol Aincreases expression, decreases reaction, increases abundance1
beta-lapachonedecreases expression1
tris(1,3-dichloro-2-propyl)phosphatedecreases expression1
sodium arsenitedecreases expression1
cobaltous chloridedecreases expression1
beta-methylcholineaffects expression1
di-n-butylphosphoric acidaffects expression1
CGP 52608affects binding, increases reaction1
abrinedecreases expression1
Temozolomidedecreases expression1
Sunitinibdecreases expression1
Leflunomidedecreases expression1
Acetaminophendecreases expression1
Air Pollutantsdecreases expression, increases abundance1
Doxorubicindecreases expression1
Ethyl Methanesulfonatedecreases expression1
Methyl Methanesulfonatedecreases expression1
Mitoxantroneaffects response to substance1
Oils, Volatileincreases expression, decreases reaction, increases abundance1
Quercetindecreases expression1
Rotenoneincreases expression1
Silicon Dioxidedecreases expression1
Tobacco Smoke Pollutiondecreases expression1
Tretinoinincreases expression1

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.