Dephosphorylation of threonine-821 of the retinoblastoma tumor suppressor protein (Rb) is required for apoptosis induced by UV and Cdk inhibition

视网膜母细胞瘤抑癌蛋白（Rb）苏氨酸-821的去磷酸化是紫外线和Cdk抑制诱导细胞凋亡所必需的。