Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Thrb2NM_00938010090Nr1a2    Thrb1    T3R[b]    T3Rbeta    c-erbAbeta    Thrb   
THRB2NM_0004619606GRTH    THR1    ERBA2    NR1A2    THRB1    ERBA-BETA    THRB   

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

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