Your Query returns 11 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
map2k3BC0441297955MKK3    zMKK3   
Map2k3NM_00892810090MEK3    MKK3    Prkmk3    mMKK3b   
map2k3NM_1317247955MKK3    zMKK3   
MAP2K3BC0324789606MEK3    MKK3    PRKMK3    MAPKK3   
MAP2K3NM_0027569606MEK3    MKK3    MAPKK3    PRKMK3   
MAP2K3NM_1451099606MEK3    MKK3    MAPKK3    PRKMK3   
MAP2K3NM_1451109606MEK3    MKK3    MAPKK3    PRKMK3   
Map2k3NT_03951510090
Map2k3BC00746710090MEK3    MKK3    mMKK3b   
MAP2K3AY33577532630
MAP2K3NT_0308439606

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

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Text2Knowledge ... Yong Huang 2002