mapk1.S( African Clawed Frog ) Entrez Gene 398985 Entrez Gene 398985 mitogen-activated protein kinase 1 S homeolog Alias erk|erk2|ert1|mapk|mapk1|mapk1-a|mapk1-b|mapk1a|mapk2|mpk1|p42mapk|prkm1|prkm2|xp42