Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Map2k1NM_00892710090Mek1    MEKK1    MAPKK1    Prkmk1    176872
Map2k1NW_04779910116
MAP2K1AF1904979606MEK1    176872
MAP2K1AF1904989606MEK1    176872
MAP2K1AY4122099606176872
MAP2K1AY4122109598
MAP2K1AY41221110090176872
MAP2K1NM_0027559606MEK1    MKK1    MAPKK1    PRKMK1    176872
Map2k1NT_03947410090176872
Map2k1BC05475410090MAPKK1    176872
Map2k1NM_03164310116Mek1   
MAP2K1NT_0101949606176872

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

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Text2Knowledge ... Yong Huang 2002