Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
HER-2NM_1310897955her2   
her-2NC_0032816239Y47D3A.6a    Y47D3A.6b    tra-1   
her-2NM_0670396239Y47D3A.6a    Y47D3A.6b    tra-1   
her-2NM_1712306239Y47D3A.6a    Y47D3A.6b    tra-1   
HER-2M869109606ERBB2   
HER-2NM_0044489606NEU    NGL    HER2    TKR1    ERBB2   
HER-2BC02708010090Neu    c-erbB2    HER2    c-neu    Erbb2   
HER-2BC04681110090Neu    c-erbB2    HER2    c-neu    Erbb2   
HER-2BC05307810090Neu    c-erbB2    HER2    c-neu    Erbb2   
HER-2X973307955
HER-2AF1777619606c-erbB-2   

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

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Text2Knowledge ... Yong Huang 2002