Figure 2. RA promotes cell cycle arrest of CC cells. Flow cytometry was used for the detection of cell cycle in (A) Hela and (B) c-33A cells treated with RA. (C) The expression of cell cycle-related proteins in Hela and c-33A cells was determined using western blot analysis. *P<0.05, *P<0.01, *P<0.001 vs. control; #P<0.05, #P<0.01, #P<0.001 vs. RA (24 h).