Your Query returns 9 Accession Numbers:
Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
MAPK2NM_01194910090ERK    Erk2    PRKM2    Prkm1    p41mapk    p42mapk    9030612K14Rik    Mapk1   
MAPK2BC0178329606ERK    ERK2    PRKM1    P42MAPK    PRKM2    ERT1    p40    p41    p38    p41mapk    MAPK1   
MAPK2NM_0027459606ERK    p38    p40    p41    ERK2    ERT1    PRKM1    PRKM2    P42MAPK    p41mapk    MAPK1   
MAPK2NM_1389579606ERK    p38    p40    p41    ERK2    ERT1    PRKM1    PRKM2    P42MAPK    p41mapk    MAPK1   
MAPK2BC00670810090Prkm1    ERK    Erk2    PRKM2    p41mapk    p42mapk    9030612K14Rik    Mapk1   
MAPK2BC05825810090ERK    PRKM2    p41mapk    p42mapk    Mapk1   
MAPK2AF1944164530
Mapk2AF1543293888
mapk2AJ2503114530

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

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Text2Knowledge ... Yong Huang 2002