(1) CDK4_NF_don@cell+p16INK4a*@cell - SERTAD1@cell -> CDK4:p16INK4a*@cell (2) CDK6@cell+p16INK4a*@cell -> CDK6:p16INK4a*@cell (3) CDK4@cell+p16INK4a*@cell - SERTAD1@cell -> CDK4:p16INK4a*@cell