Three of the four BLS genetic complementation groups have defects in the activity of the MHC class II transcription factor RFX .
three of the four bls genetic complementation groups have defects in the activity of the mhc class ii transcription factor rfx .
O O O O B-other_name O O O O O O O O O O B-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group I-protein_family_or_group B-protein_molecule O