Per2 inhibits K562 leukemia cell growth in vitro and in vivo through cell cycle arrest and apoptosis induction - Sun, C M; Huang, S F; Zeng, J M; Liu, D B; Xiao, Q; Tian, W J; Zhu, X D; Huang, Z G; Feng, W L (Pathol Oncol Res, 2010)