tokens: Northern blot analysis failed to detect IL-2 mRNA , suggesting that IL-2 may act in a paracrine manner in vivo .
folded_tokens: northern blot analysis failed to detect il-2 mrna , suggesting that il-2 may act in a paracrine manner in vivo .
labels: B-other_name I-other_name I-other_name O O O B-RNA_molecule I-RNA_molecule O O O B-protein_molecule O O O O O O O O O