Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mMKK3bNM_00892810090MEK3    MKK3    Prkmk3    Map2k3   
mMKK3bBC00746710090MEK3    MKK3    Map2k3   

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

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Text2Knowledge ... Yong Huang 2002