tokens: Human RAR alpha was expressed in H9 , U937 and THP-1 cells , but almost undetectable in CEM cells .
folded_tokens: human rar alpha was expressed in h9 , u937 and thp-1 cells , but almost undetectable in cem cells .
labels: B-protein_molecule I-protein_molecule I-protein_molecule O O O B-cell_line O B-cell_line O B-cell_line I-cell_line O O O O O B-cell_line I-cell_line O