Studies on RA time-response or pulse treatment in semisolid or liquid culture show that early RA addition is most effective , thus indicating that early but not late HPC are sensitive to its action .
studies on ra time-response or pulse treatment in semisolid or liquid culture show that early ra addition is most effective , thus indicating that early but not late hpc are sensitive to its action .
O O B-other_organic_compound O O O O O O O O O O O O B-other_organic_compound O O O O O O O O O O O O B-cell_type O O O O O O