Your Query returns 10 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MKK2BC0186459606MEK2    PRKMK2    MAPKK2    MAP2K2    601263
MKK2NM_0306629606MEK2    MAPKK2    PRKMK2    MAP2K2    601263
MKK2BC0004719606MEK2    PRKMK2    MAPKK2    MAP2K2    601263
MKK2AJ2932905665
MKK2U437034932
MKK2U102804932
MKK2L1493610116
MKK2AY09055498236
MKK2AY5333014043
MKK2NC_0011484932SSP33    LPI6   

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

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Text2Knowledge ... Yong Huang 2002