Your Query returns 4 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MAPKK3BC0324789606MEK3    MKK3    PRKMK3    MAP2K3    602315
MAPKK3NM_0027569606MEK3    MKK3    PRKMK3    MAP2K3    602315
MAPKK3NM_1451099606MEK3    MKK3    PRKMK3    MAP2K3    602315
MAPKK3NM_1451109606MEK3    MKK3    PRKMK3    MAP2K3    602315

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

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Text2Knowledge ... Yong Huang 2002