Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MGC55598BC0444367955Creb1    zgc:55598   
MGC55598NM_2009097955Creb1    zgc:55598   

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

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Text2Knowledge ... Yong Huang 2002