In the absence of estrogen about half of the cells enter a quiescent non-proliferative state whereas the others die by apoptosis .
in the absence of estrogen about half of the cells enter a quiescent non-proliferative state whereas the others die by apoptosis .
O O O O B-lipid O O O O O O O B-other_name I-other_name I-other_name O O O O O B-other_name O