tokens: Interleukin 2 and T cell antigen receptor signals converge upon serine 727 .
folded_tokens: interleukin 2 and t cell antigen receptor signals converge upon serine 727 .
labels: B-protein_molecule I-protein_molecule O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group O O O B-amino_acid_monomer I-amino_acid_monomer O