Objective To investigate the effect of 9 cis Retinoic Acid (9 cis RA) on cell cycle and differentiation in L 78 and A 2 Lung squamous carcinoma cell lines.

• 目的 观察 9 顺维甲酸 (9 cis RA)对肺鳞癌细胞周期及分化作用的影响。