Your Query returns 2 Accession Numbers:

Query TermAccessionNCBI TaxonidSynonymsPhenotype (OMIM) *
Esrk1NM_01195210090p44    Erk1    Erk-1    Prkm3    p44erk1    p44mapk    Mapk3   
Esrk1NM_01734710116p44    ERK1    Erk-1    Prkm3    p44erk1    p44mapk    Mapk3   

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

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Text2Knowledge ... Yong Huang 2002