(center map)
(1) p53*_Ser15_pho@nucleus - CHEK1_S317_pho_S345_pho@nucleus - CHEK2_Thr68_pho@nucleus -> p53*_Ser15_pho_Ser20_pho@nucleus
(2) CHEK1@nucleus - ATR@nucleus -> CHEK1_S317_pho_S345_pho@nucleus
(3) CDC25C__pho@nucleus - CHEK1_S317_pho_S345_pho@nucleus - CHEK2_Thr68_pho@nucleus -> CDC25C_Ser216_pho__pho@nucleus
(4) WEE1@nucleus - CHEK1_S317_pho_S345_pho@nucleus - CDC2_Thr161_pho:cyclin B1*@nucleus -> WEE1__pho@nucleus