Nucleolin is one component of the B cell-specific transcription factor and switch region binding protein , LR1 .
nucleolin is one component of the b cell-specific transcription factor and switch region binding protein , lr1 .
B-protein_molecule O O O O O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O B-protein_molecule I-protein_molecule I-protein_molecule I-protein_molecule O B-protein_complex O