Your Query returns 6 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
p44mapkNM_01195210090p44    Erk1    Erk-1    Esrk1    Prkm3    p44erk1    Mapk3   
P44MAPKBC0139929606ERK1    PRKM3    P44ERK1    MAPK3   
P44MAPKNM_0027469606ERK1    PRKM3    P44ERK1    MAPK3   
p44mapkBC01375410090Prkm3    p44    Erk-1    p44erk1    Mapk3   
p44mapkBC02971210090p44    Erk-1    p44erk1    Mapk3   
p44mapkNM_01734710116p44    ERK1    Erk-1    Esrk1    Prkm3    p44erk1    Mapk3   

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

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Text2Knowledge ... Yong Huang 2002