(center map)
(1) CDK6@cell+p16INK4a*@cell -> CDK6:p16INK4a*@cell
(2) CDK6@cell+p15INK4b*@cell -> CDK6:p15INK4b*@cell
(3) CDK6@cell+cyclin D1*@cell -> CDK6:cyclin D1*@cell
(4) CDK6:cyclin D1*_Thr286_pho@cell -> cyclin D1*_Thr286_pho@cell+CDK6@cell