tokens: Upon TPA treatment , the activity of ERK1 and ERK2 rapidly increased , with maximal induction between 1 and 3 h , while ERK2 protein levels remained constant .
folded_tokens: upon tpa treatment , the activity of erk1 and erk2 rapidly increased , with maximal induction between 1 and 3 h , while erk2 protein levels remained constant .
labels: O B-other_organic_compound O O O O O B-protein_molecule O B-protein_molecule O O O O O O O O O O O O O B-protein_molecule O O O O O