Your Query returns 14 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mapk3BC0455057955
Mapk3AF1530613888
mapk3AJ3145824530
Mapk3NM_01195210090p44    Erk1    Erk-1    Esrk1    Prkm3    p44erk1    p44mapk    601795
Mapk3NW_04756210116
MAPK3BC0139929606ERK1    PRKM3    P44ERK1    P44MAPK    601795
MAPK3NM_0027469606ERK1    PRKM3    P44ERK1    P44MAPK    601795
Mapk3BC01375410090Prkm3    p44    Erk-1    p44erk1    p44mapk    601795
Mapk3BC02971210090p44    Erk-1    p44erk1    p44mapk    601795
MAPK3AY33559532630
mapk3BC0664017955ERK1    zERK1   
MAPK3NT_0248129606601795
mapk3NM_2015077955ERK1    zERK1   
Mapk3NM_01734710116p44    ERK1    Erk-1    Esrk1    Prkm3    p44erk1    p44mapk   

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

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Text2Knowledge ... Yong Huang 2002