Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MGC64220BC0546467955Slc18a3    zgc:64220   
MGC64220NM_2011077955Slc18a3    zgc:64220   

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

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Text2Knowledge ... Yong Huang 2002