there are three possible levels of adult urothelial proliferation with cell cycle times of about a ) one year ( if the urothelium is homogeneous and the growth fraction unity ) , b ) three weeks ( if the growth fraction is about 5 % ) , and c ) 15 h ( when the urothelial cells are rapidly regenerating ) .
C0227598
urothelium
C0227599
urothelial cells