Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Prkmk1NM_00892710090Mek1    MEKK1    MAPKK1    Map2k1    176872
PRKMK1NM_0027559606MEK1    MKK1    MAPKK1    MAP2K1    176872

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

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Text2Knowledge ... Yong Huang 2002