Your Query returns 26 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
mapk1BC0501697955
mapk1AJ3145814530
mapk1AJ6060184565
Mapk1AY18449693591
MAPK1AF1944154530
Mapk1NT_08235510090176948
Mapk1NM_01194910090ERK    Erk2    MAPK2    PRKM2    Prkm1    p41mapk    p42mapk    9030612K14Rik    176948
mapk1NM_1828887955
Mapk1NW_04735810116
MAPK1BC0178329606ERK    ERK2    PRKM1    P42MAPK    MAPK2    PRKM2    ERT1    p40    p41    p38    p41mapk    176948
MAPK1AY4156779606176948
MAPK1AY4156789598
MAPK1AY41567910090176948
MAPK1NM_0027459606ERK    p38    p40    p41    ERK2    ERT1    MAPK2    PRKM1    PRKM2    P42MAPK    p41mapk    176948
MAPK1AF5138689544
MAPK1NM_1389579606ERK    p38    p40    p41    ERK2    ERT1    MAPK2    PRKM1    PRKM2    P42MAPK    p41mapk    176948
MAPK1NM_1757939913ERK2   
Mapk1NT_03962410090176948
Mapk1BC00670810090Prkm1    ERK    Erk2    MAPK2    PRKM2    p41mapk    p42mapk    9030612K14Rik    176948
Mapk1BC05825810090ERK    MAPK2    PRKM2    p41mapk    p42mapk    176948
MAPK1AY33571432630
mapk1BC0658687955zERK2   
Mapk1AY3280855530
MAPK1NT_0115209606176948
Mapk1NM_05384210116Erk2   
MAPK1NM_2041509031

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

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Text2Knowledge ... Yong Huang 2002