tokens: Interferon-gamma ( IFN-gamma ) is produced by natural killer cells and certain subsets of T cells , but the basis for its selective expression is unknown .
folded_tokens: interferon-gamma ( ifn-gamma ) is produced by natural killer cells and certain subsets of t cells , but the basis for its selective expression is unknown .
labels: B-protein_molecule O B-protein_molecule O O O O B-cell_type I-cell_type I-cell_type O O O O B-cell_type I-cell_type O O O O O O O O O O O