Your Query returns 5 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Prkmk3NM_00892810090MEK3    MKK3    mMKK3b    Map2k3    602315
PRKMK3BC0324789606MEK3    MKK3    MAPKK3    MAP2K3    602315
PRKMK3NM_0027569606MEK3    MKK3    MAPKK3    MAP2K3    602315
PRKMK3NM_1451099606MEK3    MKK3    MAPKK3    MAP2K3    602315
PRKMK3NM_1451109606MEK3    MKK3    MAPKK3    MAP2K3    602315

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

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Text2Knowledge ... Yong Huang 2002