Your Query returns 9 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
Gpr20	NM_173365	10090	A430106B11 A430106B11Rik	601908
GPR20	U66579	9606		601908
GPR20	AY402795	9606		601908
GPR20	AY402796	9598
GPR20	AY402797	10090		601908
GPR20	NM_005293	9606		601908
Gpr20	NT_081921	10090		601908
GPR20	NT_028251	9606		601908
Gpr20	NM_022216	10116	P2Y4 Gpcr5-1

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* OMIM link based on symbol match for human and mouse.

Text2Knowledge ... Yong Huang 2002