When added pulsewise to immature cells , differentiation was accelerated while more mature cells underwent premature cell death .
when added pulsewise to immature cells , differentiation was accelerated while more mature cells underwent premature cell death .
O O O O B-cell_type I-cell_type O O O O O O B-cell_type I-cell_type O B-other_name I-other_name I-other_name O