NF-Y is formed by three subunits , A , B , and C , all of which are necessary for DNA binding .
nf-y is formed by three subunits , a , b , and c , all of which are necessary for dna binding .
B-protein_molecule O O O O B-protein_subunit O B-protein_subunit O B-protein_subunit O O B-protein_subunit O O O O O O O O O O