The Id family of helix-loop-helix proteins function as negative regulators of DNA binding , basic helix-loop-helix proteins in the regulation of cell growth and differentiation .
the id family of helix-loop-helix proteins function as negative regulators of dna binding , basic helix-loop-helix proteins in the regulation of cell growth and differentiation .
O O O O B-protein_family_or_group I-protein_family_or_group O O O O O O O O O B-protein_family_or_group I-protein_family_or_group O O O O O O O O O