Objective:To detect expression changes of retinoi d acid receptors(RARs) and retinoid X receptors(RXRs) of PG and A549 lung adenocarcinoma cells before and after being treated with 9 cis RA in different time phase respectively.

• 目的：观察9－顺维甲酸（9－cis－RA）处理前后人肺腺癌细胞株PG和A549维甲酸受体（RARs）及维甲类X受体 （RXRs）不同时相mRNA转录水平的表达。