The phosphorylation of STAT proteins on serine residues is also required for competent STAT transcription .
the phosphorylation of stat proteins on serine residues is also required for competent stat transcription .
O O O B-protein_family_or_group I-protein_family_or_group O B-amino_acid_monomer I-amino_acid_monomer O O O O O B-protein_family_or_group O O