Treatment of cells with PD98059 , a specific inhibitor of mitogen-activated protein kinase kinase ( MEK ) , inhibited TPA -induced ERK2 activity .
treatment of cells with pd98059 , a specific inhibitor of mitogen-activated protein kinase kinase ( mek ) , inhibited tpa -induced erk2 activity .
O O O O B-other_organic_compound O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O B-protein_family_or_group O O O B-other_organic_compound O B-protein_molecule O O