Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
EstrNM_00795610090ERa    ESR    ER[a]    Estra    Nr3a1    ERalpha    Esr1   
estRX88895471

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

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Text2Knowledge ... Yong Huang 2002