(center map)
(1) p53*@nucleus - CHEK2_Thr68_pho@nucleus - ATR@nucleus - ATM_Ser 1981_pho:NBS1__pho@nucleus -> p53*_Ser15_pho@nucleus
(2) CHEK1@nucleus - ATR@nucleus -> CHEK1_S317_pho_S345_pho@nucleus
(3) DP1*:E2F1_Lys_ace:PCAF@nucleus - ATR@nucleus - ATM_Ser 1981_pho@nucleus -> DP1*:E2F1_Lys_ace_Ser31_pho@nucleus+PCAF@nucleus