Your Query returns 9 Accession Numbers:

Query Term	Accession	NCBI Taxonid	Synonyms	Phenotype (OMIM) *
LEP503	NM_018655	9606	LENEP	607377
Lep503	BC006806	10090	Lenep	607377
Lep503	BC009152	10090	Lenep	607377
Lep503	NM_020517	10090	Lenep	607377
Lep503	NM_053614	10116	Elp Lenep
LEP503	AF144412	9606		607377
LEP503	AF268478	9606		607377
LEP503	AF144410	10116
Lep503	AF144411	10090		607377

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

Text2Knowledge ... Yong Huang 2002