tokens: A mutant of KBF1/p50 ( delta SP ) , unable to bind to DNA but able to form homo- or heterodimers , has been constructed .
folded_tokens: a mutant of kbf1/p50 ( delta sp ) , unable to bind to dna but able to form homo- or heterodimers , has been constructed .
labels: O O O B-protein_molecule O B-protein_molecule I-protein_molecule O O O O O O O O O O O O O B-protein_complex O O O O O