Your Query returns 7 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
c-erbB-2AF1777619606HER-2   
c-ERBB-2AB0252859606
c-ERBB-2AB0252869606
c-ERBB-2AB0966129606
c-ERBB-2AB0966139606
c-ERBB-2AB0966139606
c-ERBB-2AB0966149606

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

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Text2Knowledge ... Yong Huang 2002