We identified a stretch of 23 amino acids , rich in serine and threonine residues , which was responsible for most of the repression activity .
we identified a stretch of 23 amino acids , rich in serine and threonine residues , which was responsible for most of the repression activity .
O O O O O B-peptide I-peptide I-peptide O O O B-amino_acid_monomer O B-amino_acid_monomer O O O O O O O O O O O O