GPBP1

Summary

GPBP1 (GC-rich promoter binding protein 1, HGNC:29520) is a protein-coding gene on chromosome 5q11.2, encoding Vasculin (Q86WP2). Functions as a GC-rich promoter-specific transactivating transcription factor.

This gene was originally isolated by subtractive hybridization of cDNAs expressed in atherosclerotic plaques with a thrombus, and was found to be expressed only in vascular smooth muscle cells. However, a shorter splice variant was found to be more ubiquitously expressed. This protein is suggested to play a role in the development of atherosclerosis. Studies in mice suggest that it may also function as a GC-rich promoter-specific trans-activating transcription factor. Several alternatively spliced transcript variants encoding different isoforms have been described for this gene.

Source: NCBI Gene 65056 — RefSeq curated summary.

At a glance

• GWAS associations: 5
• Clinical variants (ClinVar): 71 total
• MANE Select transcript: NM_022913

Identifiers

Gene identifiers

Field	Value
HGNC ID	HGNC:29520
Approved symbol	GPBP1
Name	GC-rich promoter binding protein 1
Location	5q11.2
Locus type	gene with protein product
Status	Approved
Aliases	DKFZp761C169
Ensembl gene	ENSG00000062194
Ensembl biotype	protein_coding
OMIM	608412
Entrez	65056

Gene structure

Transcript identifiers

Ensembl transcripts: 53 — 49 protein_coding, 4 retained_intron

ENST00000264779, ENST00000309096, ENST00000424459, ENST00000506184, ENST00000511209, ENST00000513524, ENST00000513732, ENST00000514387, ENST00000515484, ENST00000899283, ENST00000899284, ENST00000899285, ENST00000899286, ENST00000899287, ENST00000899288, ENST00000899289, ENST00000899290, ENST00000899291, ENST00000899292, ENST00000899293, ENST00000899294, ENST00000899295, ENST00000899296, ENST00000899297, ENST00000899298, ENST00000899299, ENST00000899300, ENST00000899301, ENST00000899302, ENST00000899303, ENST00000899304, ENST00000899305, ENST00000899306, ENST00000935644, ENST00000935645, ENST00000935646, ENST00000935647, ENST00000935648, ENST00000935649, ENST00000935650, ENST00000935651, ENST00000935652, ENST00000935653, ENST00000952538, ENST00000952539, ENST00000952540, ENST00000952541, ENST00000952542, ENST00000952543, ENST00000952544, ENST00000952545, ENST00000952546, ENST00000952547

RefSeq mRNA: 5 — MANE Select: NM_022913 NM_001127235, NM_001127236, NM_001203246, NM_001331037, NM_022913

CCDS: CCDS34162, CCDS47211, CCDS47212, CCDS56368, CCDS82998

Canonical transcript exons

ENST00000506184 — 12 exons

Exon	Start	End
ENSE00001224247	57214074	57214193
ENSE00001353106	57175448	57176400
ENSE00001505396	57261180	57261282
ENSE00002087793	57262594	57264673
ENSE00002106815	57174059	57174211
ENSE00003474223	57235966	57236032
ENSE00003492392	57246300	57246484
ENSE00003500337	57249409	57249576
ENSE00003525687	57250954	57251141
ENSE00003528720	57247075	57247215
ENSE00003569342	57230846	57230969
ENSE00003649050	57231098	57231321

Expression profiles

Bgee: expression breadth ubiquitous, 264 present calls, max score 98.29.

FANTOM5 (CAGE): breadth ubiquitous, TPM avg 40.6016 / max 972.7196, expressed in 1804 samples.

FANTOM5 promoters (10 alternative TSS)

Promoter ID	TPM avg	Samples expressed
56524	25.9514	1795
56521	10.7913	1611
56523	1.0775	656
56530	0.8606	229
56525	0.4919	247
56527	0.3675	155
56529	0.3235	137
56526	0.2910	119
56528	0.2235	71
56522	0.2232	104

Top tissues by expression

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

Tissue	Anatomy ID	Expression score	Quality
ventricular zone	UBERON:0003053	98.29	gold quality
cardiac muscle of right atrium	UBERON:0003379	98.08	gold quality
calcaneal tendon	UBERON:0003701	98.06	gold quality
corpus callosum	UBERON:0002336	98.05	gold quality
primordial germ cell in gonad	CL:0000670 ∩ UBERON:0000991	98.04	gold quality
left ventricle myocardium	UBERON:0006566	98.00	gold quality
mucosa of paranasal sinus	UBERON:0005030	97.93	gold quality
epithelium of nasopharynx	UBERON:0001951	97.84	gold quality
nasopharynx	UBERON:0001728	97.82	gold quality
embryo	UBERON:0000922	97.78	gold quality
ganglionic eminence	UBERON:0004023	97.78	gold quality
kidney epithelium	UBERON:0004819	97.61	gold quality
ileal mucosa	UBERON:0000331	97.54	gold quality
myocardium	UBERON:0002349	97.54	gold quality
sperm	CL:0000019	97.37	gold quality
endothelial cell	CL:0000115	97.34	gold quality
upper arm skin	UBERON:0004263	97.29	gold quality
tendon	UBERON:0000043	97.27	gold quality
palpebral conjunctiva	UBERON:0001812	97.27	gold quality
adrenal tissue	UBERON:0018303	97.27	gold quality
tibialis anterior	UBERON:0001385	97.22	gold quality
buccal mucosa cell	CL:0002336	97.20	gold quality
amniotic fluid	UBERON:0000173	97.20	gold quality
cartilage tissue	UBERON:0002418	97.19	gold quality
male germ line stem cell (sensu Vertebrata) in testis	CL:0000089 ∩ UBERON:0000473	97.18	gold quality
bronchial epithelial cell	CL:0002328	97.13	gold quality
bronchus	UBERON:0002185	97.13	gold quality
right testis	UBERON:0004534	97.10	gold quality
deltoid	UBERON:0001476	97.05	gold quality
cerebellar hemisphere	UBERON:0002245	97.05	gold quality

Single-cell (SCXA)

Detected in 4 experiment(s), a significant marker in 3.

Experiment	Marker?	Max mean expression
E-MTAB-6075	yes	1028.83
E-GEOD-135922	yes	22.81
E-CURD-135	no	1057.55
E-ANND-3	no	0.00

Regulation

Is transcription factor: no

miRNA regulators (miRDB)

141 targeting GPBP1, 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-4795-3P	100.00	74.62	4024
HSA-MIR-3613-3P	100.00	76.36	7965
HSA-MIR-126-5P	100.00	72.71	3180
HSA-MIR-4668-3P	100.00	68.74	2635
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-196A-1-3P	99.99	72.15	2772
HSA-MIR-4282	99.99	75.36	6408
HSA-MIR-548AW	99.99	72.57	3559
HSA-MIR-548C-3P	99.99	74.01	7587
HSA-MIR-5696	99.98	72.36	4487
HSA-MIR-548P	99.98	72.25	3784
HSA-MIR-520D-5P	99.98	73.34	4883
HSA-MIR-524-5P	99.98	73.43	4882
HSA-MIR-19A-3P	99.98	75.33	2762
HSA-MIR-19B-3P	99.98	75.44	2754
HSA-MIR-499A-5P	99.98	70.79	1323
HSA-MIR-3065-5P	99.97	71.56	3281
HSA-MIR-9-3P	99.96	70.88	2068
HSA-MIR-570-3P	99.96	72.41	4910
HSA-MIR-548AA	99.96	70.64	3753
HSA-MIR-548AP-3P	99.96	70.64	3753
HSA-MIR-548T-3P	99.96	70.64	3753
HSA-MIR-539-5P	99.93	70.30	2855
HSA-MIR-22-3P	99.93	68.13	917
HSA-MIR-145-5P	99.92	71.13	1836
HSA-MIR-5195-3P	99.92	70.92	1877

Literature-anchored findings (GeneRIF, showing 3)

• This publication discusses both human and mouse GC-rich promoter binding protein. (PMID:11256614)
• Vasculin is a novel vascular protein differentially expressed in human atherogenesis (PMID:12842993)
• occurrence of an unusual TG 3’ splice site in intron 9 (PMID:17672918)

Cross-species orthologs

2 orthologs

Organism	Symbol	Gene ID
mus_musculus	Gpbp1	ENSMUSG00000032745
rattus_norvegicus	Gpbp1	ENSRNOG00000013002

Paralogs (1): GPBP1L1 (ENSG00000159592)

Protein

Protein identifiers

Vasculin — Q86WP2 (reviewed: Q86WP2)

Alternative names: GC-rich promoter-binding protein 1, Vascular wall-linked protein

All UniProt accessions (2): Q86WP2, D4PHA4

UniProt curated annotations — full annotation on UniProt →

Function. Functions as a GC-rich promoter-specific transactivating transcription factor.

Subunit / interactions. Interacts with GTF2B, GTF2F2, RNA polymerase II and TBP.

Subcellular location. Nucleus. Cytoplasm.

Tissue specificity. Widely expressed. Some isoforms may be specifically expressed in veins and arteries (at protein level). Isoform 4 is widely expressed. Isoform 1, isoform 2 and isoform 3 may be specifically expressed in vascular smooth muscle cells.

Similarity. Belongs to the vasculin family.

Isoforms (4)

UniProt ID	Names	Canonical?
Q86WP2-1	1	yes
Q86WP2-2	2
Q86WP2-3	3
Q86WP2-4	4

RefSeq proteins (5): NP_001120707, NP_001120708, NP_001190175, NP_001317966, NP_075064* (*=MANE)

Domains & families (InterPro)

ID	Name	Type
IPR028128	Vasculin_fam	Family

Pfam: PF15337

UniProt features (21 total): modified residue 6, compositionally biased region 5, region of interest 4, splice variant 3, chain 1, sequence variant 1, sequence conflict 1

Structure

Experimental structures (PDB)

0 structures.

Predicted structure (AlphaFold)

Model	pLDDT	Fraction very-high
AF-Q86WP2-F1	54.54	0.04

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 (6): 49, 87, 274, 276, 322, 381

Function

Pathways and Gene Ontology

Reactome pathways

0 pathways

MSigDB gene sets: 215 (showing top): ATF_B, CREL_01, TAATAAT_MIR126, GCM_GSPT1, CREBP1_Q2, AP2_Q3, CAGCTG_AP4_Q5, SRF_Q5_01, CREB_Q4, NFKB_C, E2F1DP1_01, E2F1DP2_01, FREAC3_01, MILI_PSEUDOPODIA_HAPTOTAXIS_UP, TGCTGAY_UNKNOWN

GO Biological Process (4): DNA-templated transcription (GO:0006351), regulation of DNA-templated transcription (GO:0006355), positive regulation of transcription by RNA polymerase II (GO:0045944), positive regulation of DNA-templated transcription (GO:0045893)

GO Molecular Function (4): DNA binding (GO:0003677), DNA-binding transcription factor activity (GO:0003700), RNA binding (GO:0003723), protein binding (GO:0005515)

GO Cellular Component (4): nucleus (GO:0005634), cytosol (GO:0005829), plasma membrane (GO:0005886), cytoplasm (GO:0005737)

GO top-level categories

Rollup of top GO terms by namespace:

Category	Terms
DNA-templated transcription	2
regulation of DNA-templated transcription	2
nucleic acid binding	2
cellular anatomical structure	2
gene expression	1
RNA biosynthetic process	1
regulation of gene expression	1
regulation of RNA biosynthetic process	1
regulation of transcription by RNA polymerase II	1
transcription by RNA polymerase II	1
positive regulation of DNA-templated transcription	1
positive regulation of RNA biosynthetic process	1
transcription cis-regulatory region binding	1
transcription regulator activity	1
binding	1
intracellular membrane-bounded organelle	1
cytoplasm	1
membrane	1
cell periphery	1
intracellular anatomical structure	1

Protein interactions and networks

STRING

822 interactions, top by confidence (×1000):

Protein A	Protein B	Partner UniProt	Score
GPBP1	TOP2A	P11388	670
GPBP1	GTF2B	Q00403	584
GPBP1	PSMC1	P49014	469
GPBP1	SSH3	Q8TE77	447
GPBP1	EP300	Q09472	411
GPBP1	EAPP	Q56P03	401
GPBP1	CCDC174	Q6PII3	371
GPBP1	SH3D19	Q5HYK7	370
GPBP1	DRG2	P55039	365
GPBP1	SLC9A1	P19634	362
GPBP1	ZCCHC4	Q9H5U6	356
GPBP1	ARFGEF3	Q5TH69	353
GPBP1	FAM120B	Q96EK7	352
GPBP1	CERT1	Q9Y5P4	348
GPBP1	ZNF730	Q6ZMV8	348

IntAct

75 interactions, top by confidence:

A	B	Type	Score
FNDC11	GPBP1	psi-mi:“MI:0915”(physical association)	0.830
GPBP1	FNDC11	psi-mi:“MI:0915”(physical association)	0.830
GPBP1	MCRS1	psi-mi:“MI:0915”(physical association)	0.700
YWHAG	BLTP3B	psi-mi:“MI:2364”(proximity)	0.640
YWHAH	BLTP3B	psi-mi:“MI:2364”(proximity)	0.570
GPBP1	PLEKHF2	psi-mi:“MI:0915”(physical association)	0.560
PLEKHF2	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
HSF2BP	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
CCDC57	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
GPBP1	NXF1	psi-mi:“MI:0915”(physical association)	0.560
FAM161A	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
GPBP1	PRPF18	psi-mi:“MI:0915”(physical association)	0.560
RACK1	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
QARS1	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
MORF4L2	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
PSMB1	GPBP1	psi-mi:“MI:0915”(physical association)	0.560
SLX1A	BACH1	psi-mi:“MI:0914”(association)	0.530
TPD52	TPD52L2	psi-mi:“MI:0914”(association)	0.530
ankX	GPBP1	psi-mi:“MI:0915”(physical association)	0.520
GPBP1	ACTN3	psi-mi:“MI:0915”(physical association)	0.400
GPBP1	PCNA	psi-mi:“MI:0915”(physical association)	0.370

BioGRID (100): C20orf195 (Two-hybrid), PLEKHF2 (Two-hybrid), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Affinity Capture-MS), GPBP1 (Two-hybrid), GPBP1 (Affinity Capture-MS), PKP3 (Affinity Capture-MS), PLCD1 (Affinity Capture-MS)

ESM2 similar proteins: A4FVR1, A8MQL1, F4IUY8, G5CEW6, O43024, O48772, O64768, O80386, P42775, Q0JDM0, Q0P5K1, Q0WPF2, Q14444, Q14671, Q1LZB6, Q2VB19, Q38796, Q56XU4, Q5M9G3, Q5R4E9, Q5R5X3, Q60865, Q642J5, Q66KI6, Q6K977, Q6NXH3, Q76E23, Q7XM16, Q80U78, Q86WP2, Q8IH18, Q8LPQ9, Q8RXE7, Q8RY18, Q8VY15, Q8VZS6, Q93ZJ9, Q94C33, Q94KE2, Q9C658

Diamond homologs: Q0P5K1, Q28FE5, Q3KR53, Q5R4E9, Q5R9C3, Q6DD19, Q6NXH3, Q6NZP2, Q86WP2, Q9HC44

SIGNOR signaling

0 interactions.

Enriched among interaction partners

Reactome pathways and GO biological processes over-represented among this gene’s 47 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
Activation of BAD and translocation to mitochondria	5	126.9×	4e-08
Chk1/Chk2(Cds1) mediated inactivation of Cyclin B:Cdk1 complex	5	112.0×	4e-08
SARS-CoV-1 targets host intracellular signalling and regulatory pathways	5	112.0×	4e-08
Activation of BH3-only proteins	5	82.8×	2e-07
RHO GTPases activate PKNs	5	52.9×	1e-06
Intrinsic Pathway for Apoptosis	5	48.8×	2e-06
SARS-CoV-1-host interactions	6	35.1×	8e-07
SARS-CoV-1 Infection	6	28.6×	2e-06

GO biological processes:

GO term	Partners	Fold	FDR
intracellular protein localization	5	13.8×	3e-03

Disease & clinical

Clinical variants and AI predictions

ClinVar

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

Classification	Count (floor)
Pathogenic	0
Likely pathogenic	0
Uncertain significance	54
Likely benign	2
Benign	0

Top pathogenic / likely-pathogenic (0)

SpliceAI

2950 predictions. Top by Δscore:

Variant	Effect	Δscore
5:57176095:T:TA	acceptor_gain	1.0000
5:57230834:A:AG	acceptor_gain	1.0000
5:57230834:AATTT:A	acceptor_gain	1.0000
5:57230835:A:G	acceptor_gain	1.0000
5:57230838:T:TA	acceptor_gain	1.0000
5:57230842:TCAGT:T	acceptor_loss	1.0000
5:57230843:CA:C	acceptor_loss	1.0000
5:57230844:A:AG	acceptor_gain	1.0000
5:57230844:A:C	acceptor_loss	1.0000
5:57230844:AGTC:A	acceptor_gain	1.0000
5:57230845:G:A	acceptor_loss	1.0000
5:57230845:G:GT	acceptor_gain	1.0000
5:57230845:GT:G	acceptor_gain	1.0000
5:57230845:GTC:G	acceptor_gain	1.0000
5:57230845:GTCG:G	acceptor_gain	1.0000
5:57230845:GTCGT:G	acceptor_gain	1.0000
5:57230966:GGAG:G	donor_gain	1.0000
5:57230967:G:GT	donor_gain	1.0000
5:57230967:GAGGT:G	donor_loss	1.0000
5:57230968:AGG:A	donor_loss	1.0000
5:57230969:GG:G	donor_loss	1.0000
5:57230970:GTAA:G	donor_loss	1.0000
5:57230971:T:A	donor_loss	1.0000
5:57230980:C:G	donor_gain	1.0000
5:57231090:A:AG	acceptor_gain	1.0000
5:57231091:A:G	acceptor_gain	1.0000
5:57231093:TAAA:T	acceptor_loss	1.0000
5:57231096:A:AC	acceptor_loss	1.0000
5:57231097:G:GT	acceptor_loss	1.0000
5:57231311:C:G	donor_gain	1.0000

AlphaMissense

3154 scored. Top likely-pathogenic:

Variant	Protein change	am_pathogenicity
5:57214158:T:A	W10R	1.000
5:57214158:T:C	W10R	1.000
5:57214146:T:C	F6L	0.999
5:57214148:T:A	F6L	0.999
5:57214148:T:G	F6L	0.999
5:57214160:G:C	W10C	0.999
5:57214160:G:T	W10C	0.999
5:57249505:T:C	F301L	0.999
5:57249506:T:C	F301S	0.999
5:57249507:T:A	F301L	0.999
5:57249507:T:G	F301L	0.999
5:57249509:T:C	L302S	0.999
5:57261185:T:C	L389S	0.999
5:57261239:T:C	L407S	0.999
5:57261262:T:C	F415L	0.999
5:57261263:T:C	F415S	0.999
5:57261264:C:A	F415L	0.999
5:57261264:C:G	F415L	0.999
5:57214162:T:C	L11P	0.998
5:57251131:G:C	A384P	0.998
5:57261180:A:C	R387S	0.998
5:57261180:A:T	R387S	0.998
5:57261182:T:C	L388S	0.998
5:57261199:T:A	W394R	0.998
5:57261199:T:C	W394R	0.998
5:57261201:G:C	W394C	0.998
5:57261201:G:T	W394C	0.998
5:57214159:G:C	W10S	0.997
5:57214162:T:A	L11H	0.997
5:57261200:G:C	W394S	0.997

dbSNP variants (sampled 300 via entrez): RS1000060323 (5:57182225 A>G), RS1000061150 (5:57228011 T>C,G), RS1000065527 (5:57198215 C>T), RS1000092109 (5:57192790 A>C,G), RS1000126922 (5:57192530 G>A), RS1000141791 (5:57214613 A>G), RS1000146094 (5:57254218 C>T), RS1000174319 (5:57177873 AT>A,ATT,ATTTTTT), RS1000176804 (5:57253843 A>G), RS1000208410 (5:57220645 A>T), RS1000213535 (5:57259711 G>A), RS1000252915 (5:57250805 A>G), RS1000303037 (5:57220304 G>A,T), RS1000303201 (5:57182578 G>T), RS1000338193 (5:57203665 A>G)

Disease associations

OMIM: gene MIM:608412 | 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):

Study	Trait	p-value
GCST002934_22	Zinc levels	9.000000e-06
GCST007094_185	Diastolic blood pressure	3.000000e-08
GCST007449_1	Normal facial asymmetry (angle of deformation score)	8.000000e-08
GCST011155_17	Nontraumatic osteonecrosis of the femoral head	5.000000e-06
GCST012341_3	Asparaginase hypersensitivity in acute lymphoblastic leukemia	3.000000e-08

EFO canonical traits (4, from GWAS)

EFO ID	Trait name
EFO:0006336	diastolic blood pressure
EFO:0009751	facial asymmetry measurement
EFO:1001930	idiopathic osteonecrosis of the femoral head
EFO:0004881	asparaginase hypersensitivity

Drugs & pharmacology

Drug and pharmacology data

Is drug target: no

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

CTD chemical–gene interactions

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

Chemical	Actions (top 5)	PubMed papers
Air Pollutants	affects cotreatment, decreases expression, increases abundance, increases oxidation	3
sodium arsenite	increases expression, decreases expression	2
aristolochic acid I	decreases expression	1
FR900359	decreases phosphorylation	1
dicrotophos	decreases expression	1
methylmercuric chloride	decreases expression	1
alpha-pinene	affects cotreatment, decreases expression, increases oxidation, increases abundance	1
aflatoxin B2	decreases methylation	1
methacrylaldehyde	affects cotreatment, decreases expression, increases oxidation, increases abundance	1
K 7174	increases expression	1
abrine	increases expression	1
bisphenol S	decreases methylation	1
jinfukang	decreases expression	1
PCI 5002	affects cotreatment, increases expression	1
Sunitinib	increases expression	1
Acetaminophen	increases expression	1
Acrolein	affects cotreatment, decreases expression, increases oxidation, increases abundance	1
Benzo(a)pyrene	affects methylation	1
Caffeine	decreases phosphorylation	1
Coal	decreases expression, increases abundance	1
Doxorubicin	decreases expression	1
Formaldehyde	decreases expression	1
Methotrexate	increases expression	1
Ozone	affects cotreatment, decreases expression, increases oxidation, increases abundance	1
Silver	increases expression	1
Smoke	decreases expression, increases abundance	1
Testosterone	decreases expression	1
Tobacco Smoke Pollution	increases expression	1
Urethane	increases expression	1
Valproic Acid	decreases expression	1

Clinical trials (associated diseases)

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