Your Query returns 13 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MEKK1NM_01194510090Mekk    MAPKKK1    Map3k1    600982
MEKK1NM_00892710090Mek1    MAPKK1    Prkmk1    Map2k1    600982
Mekk1NM_05388710116Map3k1   
Mekk1AY1186597227
MEKK1AF0428389606600982
MEKK1U2347010090600982
MEKK1U4859610116
Mekk1AF11734010090600982
Mekk1AE0037237227
mekk1AJ5751003879
Mekk1NM_1424937227MEKK    MEKK4    dMEKK    CG7717    mekk1a    mekk1b    D-MEKK1    DmMEKK1   
Mekk1NM_1698337227MEKK    MEKK4    dMEKK    CG7717    mekk1a    mekk1b    D-MEKK1    DmMEKK1   
Mekk1NT_0337777227MEKK    MEKK4    dMEKK    CG7717    mekk1a    mekk1b    D-MEKK1    DmMEKK1   

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

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Text2Knowledge ... Yong Huang 2002