The amount of trypsin -resistant fragments was proportional to receptor occupancy by the ligand , and allowed the determination of dissociation constants ( kDa ) .
the amount of trypsin -resistant fragments was proportional to receptor occupancy by the ligand , and allowed the determination of dissociation constants ( kda ) .
O O O B-protein_molecule O O O O O O O O O O O O O O O O B-other_name I-other_name O B-other_name O O