Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
c-erbB2BC02708010090Neu    HER-2    HER2    c-neu    Erbb2   
c-erbB2BC04681110090Neu    HER-2    HER2    c-neu    Erbb2   
c-erbB2BC05307810090Neu    HER-2    HER2    c-neu    Erbb2   

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

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Text2Knowledge ... Yong Huang 2002