Effects of all-trans retinoic acid on the function of Cx43 and GJIC in HaCaT cells induced by IL-22 oleh Xiao-dong LIANG, Jie DENG, Rui-xian YE, Huan-yan LIU, Qi-ying XIONG, Ru-jun XUE, Hui-heng CHEN, Yu-mei LIU, Jing-yao LIANG, Xi-bao ZHANG