Therefore , we examined the RB status of a series of B-cell mutants that are defective in class II expression , generated either in vitro or derived from Bare Lymphocyte Syndrome ( BLS ) patients .
therefore , we examined the rb status of a series of b-cell mutants that are defective in class ii expression , generated either in vitro or derived from bare lymphocyte syndrome ( bls ) patients .
O O O O O B-protein_molecule O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O