Your Query returns 12 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MEK2NM_02313810090MK2    Prkmk2    Map2k2    601263
MEK2BC0186459606PRKMK2    MKK2    MAPKK2    MAP2K2    601263
MEK2NM_0306629606MKK2    MAPKK2    PRKMK2    MAP2K2    601263
MEK2BC01483010090MK2    Map2k2    601263
MEK2BC0004719606PRKMK2    MKK2    MAPKK2    MAP2K2    601263
MEK2AF3251684097
mek2AJ5071544530
mek2S6826710095
MEK2D1459210116
MEK2L287039031
MEK2U367939031
MEK2NM_2053889031

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

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Text2Knowledge ... Yong Huang 2002