Your Query returns 3 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
ERalphaNM_00795610090ERa    ESR    Estr    ER[a]    Estra    Nr3a1    Esr1   
ERalphaAY22390248416
eralphaAJ3131959615

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

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Text2Knowledge ... Yong Huang 2002