Your Query returns 15 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MKK3BC0441297955zMKK3    map2k3   
MKK3NM_00892810090MEK3    Prkmk3    mMKK3b    Map2k3   
MKK3NM_1317247955zMKK3    map2k3   
MKK3BC0324789606MEK3    PRKMK3    MAPKK3    MAP2K3   
MKK3NG_0005237227Mek3    Mpk3    DMEK3    DMKK3    D-MKK3    CG12244    CT14280    p38MAPKK    DMKK3/lic    MEK3/MKK3    lic   
MKK3NM_0027569606MEK3    MAPKK3    PRKMK3    MAP2K3   
MKK3NM_1451099606MEK3    MAPKK3    PRKMK3    MAP2K3   
MKK3NM_1451109606MEK3    MAPKK3    PRKMK3    MAP2K3   
MKK3BC00746710090MEK3    mMKK3b    Map2k3   
MKK3NC_0043547227p38    Mek3    Mpk3    DMEK3    DMKK3    D-MKK3    CG12244    p38MAPKK    DMKK3/lic    MEK3/MKK3    l(1)G0252    lic   
MKK3NM_0578147227p38    Mek3    Mpk3    DMEK3    DMKK3    D-MKK3    CG12244    p38MAPKK    DMKK3/lic    MEK3/MKK3    l(1)G0252    lic   
MKK3AF0355507227
MKK3AJ2932915665
MKK3L367199606
MKK3X9315010090

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

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Text2Knowledge ... Yong Huang 2002