Your Query returns 6 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
heregulinNM_17859110090GGF    HRG    Hgl    NDF    ARIA    SMDF    HRGalpha    D230005F13Rik    Nrg1   
heregulinM941659606
heregulinM941669606
heregulinM941679606
heregulinM941689606
heregulinU924679606

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

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Text2Knowledge ... Yong Huang 2002