Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MGC56183BC0478387955Arpp19    zgc:56183   
MGC56183NM_2009727955Arpp19    zgc:56183   

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

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Text2Knowledge ... Yong Huang 2002