tokens: Both C1 and C2 proteins also bind to a similar sequence found in the interleukin-2 -receptor alpha-subunit enhancer .
folded_tokens: both c1 and c2 proteins also bind to a similar sequence found in the interleukin-2 -receptor alpha-subunit enhancer .
labels: O B-protein_molecule O B-protein_molecule I-protein_molecule O O O O O O O O O B-protein_molecule O O O O