tokens: In contrast , analysis of pp90rsk activity by phosphorylation of a peptide derived from S6 protein demonstrated stimulation of this kinase in TPA-treated U-937 , and not TUR , cells .
folded_tokens: in contrast , analysis of pp90rsk activity by phosphorylation of a peptide derived from s6 protein demonstrated stimulation of this kinase in tpa-treated u-937 , and not tur , cells .
labels: O O O O O B-protein_molecule O O B-other_name O O B-peptide O O B-protein_molecule I-protein_molecule O O O O B-protein_family_or_group O O O O O O O O O O