The former pathway is recruited by all ERK -activating stimuli , whereas the latter pathway uses an undefined serine kinase and is recruited selectively by cytokines .
the former pathway is recruited by all erk -activating stimuli , whereas the latter pathway uses an undefined serine kinase and is recruited selectively by cytokines .
O O O O O O O B-protein_molecule O O O O O O O O O O B-amino_acid_monomer O O O O O O B-protein_family_or_group O