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You can:

Check the GPCR table for details.
Go to the ligand list to see ligands that interacts with this GPCR.
Go to the individual ligand page for PubMed ID information by text mining.
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GPCR

Name	Histamine H4 receptor
Species	Mus musculus (Mouse)
Gene	Hrh4
Synonym	GPCR105 H4 receptor H4R HH4R
Disease	N/A for non-human GPCRs
Length	391
Amino acid sequence	MSESNSTGILPPAAQVPLAFLMSSFAFAIMVGNAVVILAFVVDRNLRHRSNYFFLNLAISDFLVGLISIPLYIPHVLFNWNFGSGICMFWLITDYLLCTASVYNIVLISYDRYQSVSNAVSYRAQHTGIMKIVAQMVAVWILAFLVNGPMILASDSWKNSTNTKDCEPGFVTEWYILTITMLLEFLLPVISVAYFNVQIYWSLWKRRALSRCPSHAGFSTTSSSASGHLHRAGVACRTSNPGLKESAASRHSESPRRKSSILVSLRTHMNSSITAFKVGSFWRSESAALRQREYAELLRGRKLARSLAILLSAFAICWAPYCLFTIVLSTYPRTERPKSVWYSIAFWLQWFNSFVNPFLYPLCHRRFQKAFWKILCVTKQPALSQNQSVSS
UniProt	Q91ZY2
Protein Data Bank	N/A
GPCR-HGmod model	N/A
3D structure model	No available structures or models
BioLiP	N/A
Therapeutic Target Database	N/A
ChEMBL	CHEMBL5657
IUPHAR	265
DrugBank	N/A

Known ligands

You can:

Click GLASS IDs to check the association information.
Click ligand names to check details of the ligands.
Download a TSV version of all interaction information.
Download a SDF structure collection of all known ligands.

GLASS ID	Molecule	Formula	Molecular weight	H-bond acceptor / donor	XlogP	Lipinski's druglikeness
46823	JNJ-39758979	C11H19N5	221.308	5 / 2	0.7	Yes
61586	SCHEMBL604437	C18H25N5O	327.432	6 / 2	1.3	Yes
68320	CHEMBL1083162	C23H26FN5O	407.493	5 / 3	4.0	Yes
553658	1-Methylhistamine	C6H11N3	125.175	2 / 1	-0.6	Yes
107814	JMC516547 Compound 5	C15H16N6	280.335	6 / 2	1.0	Yes
123589	CHEMBL2376803	C16H22N6	298.394	6 / 2	2.1	Yes
124517	JNJ-7777120	C14H16ClN3O	277.752	2 / 1	2.3	Yes
553934	H4 antagonist 48	C11H11BrN8	335.169	7 / 1	0.5	Yes
140555	PF-3893787	C13H22N6	262.361	6 / 3	1.1	Yes
169714	CHEMBL2376804	C14H18N6	270.34	6 / 2	1.0	Yes
173138	SCHEMBL4054703	C22H29N5	363.509	5 / 2	3.7	Yes
178950	UNII-8U5620H545	C17H21N5	295.39	5 / 2	2.2	Yes
196195	SCHEMBL606676	C19H25N5	323.444	5 / 2	2.9	Yes
204900	CHEMBL1086105	C24H26FN5O	419.504	5 / 2	4.1	Yes
527516	CHEMBL3805361	C19H24N6S	368.503	4 / 3	2.8	Yes
527521	CHEMBL3805220	C19H24N6S	368.503	4 / 3	2.8	Yes
563988	CHEMBL1632411	C15H19N3O	257.337	3 / 2	2.8	Yes
232084	histamine	C5H9N3	111.148	2 / 2	-0.7	Yes
494500	CHEMBL3628042	C16H19ClN6	330.82	6 / 1	2.8	Yes
554553	imetit	C6H10N4S	170.234	3 / 3	0.2	Yes
266830	CHEMBL2376800	C13H18N6	258.329	6 / 2	0.9	Yes
276031	CHEMBL2376801	C14H20N6	272.356	6 / 2	1.2	Yes
276958	A-846714	C16H18N6	294.362	6 / 1	1.5	Yes
554666	Thioperamide	C15H24N4S	292.445	2 / 2	2.4	Yes
566367	clozapine	C18H19ClN4	326.828	3 / 1	3.1	Yes
300483	CHEMBL503605	C13H14ClN3O	263.725	2 / 2	1.8	Yes
311761	UNII-Q598HK01AO	C17H21N5	295.39	5 / 2	2.1	Yes
554914	1-[4-(1H-indazol-4-yl)butyl]-3-methylthiourea	C13H18N4S	262.375	2 / 3	2.3	Yes
332470	CHEMBL1935574	C16H17N5O	295.346	6 / 2	1.7	Yes
554928	clobenpropit	C14H17ClN4S	308.828	3 / 2	3.0	Yes
336614	4-Methylhistamine	C6H11N3	125.175	2 / 2	-0.2	Yes
349087	CHEMBL3236553	C13H21N5	247.346	5 / 2	1.3	Yes
568516	CHEMBL1632412	C16H21N3O	271.364	3 / 2	3.2	Yes
360399	CHEMBL1082296	C25H31FN4O	422.548	5 / 2	4.5	Yes
360404	CHEMBL1084810	C25H31FN4O	422.548	5 / 2	4.5	Yes
367310	CHEMBL1081680	C16H25N5	287.411	5 / 2	2.2	Yes
532357	CHEMBL3805437	C12H18N6	246.318	3 / 3	0.6	Yes
532361	CHEMBL3804906	C12H18N6	246.318	3 / 3	0.6	Yes
555269	(R)-alpha-Methylhistamine	C6H11N3	125.175	2 / 2	-0.3	Yes
570243	CHEMBL1632413	C14H17ClN4O	292.767	3 / 2	2.5	Yes
419075	CHEMBL3236568	C11H19N5	221.308	5 / 2	0.9	Yes
570708	CHEMBL1632414	C14H17ClN4O	292.767	4 / 2	2.9	Yes
430876	SCHEMBL606792	C17H20FN5	313.38	6 / 2	2.3	Yes
433075	SCHEMBL603142	C18H23N5	309.417	5 / 2	2.6	Yes
440000	SCHEMBL606788	C17H21N5	295.39	5 / 2	2.2	Yes