Your Query returns 18 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Mek1NM_00892710090MEKK1    MAPKK1    Prkmk1    Map2k1    176872
MEK1AF1904979606MAP2K1    176872
MEK1AF1904989606MAP2K1    176872
MEK1NM_0027559606MKK1    MAPKK1    PRKMK1    MAP2K1    176872
Mek1NM_03164310116Map2k1   
MEK1AF0009773702
MEK1AF08043639946
MEK1X957204932
MEK1Z752594932
mek1AJ0007284081
MEK1X834404102
mek1AJ3026514097
mek1Z985964896SPAC14C4.03   
mek1NC_0034244896SPAC14C4.03   
MEK1AF1574879606176872
MEK1D1459110116
MEK1L352449135
MEK10N/AMRE4   

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

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Text2Knowledge ... Yong Huang 2002