(center map)
(1) DP1*:E2F1:pRB*__pho__pho__pho@nucleus -> pRB*__pho__pho__pho@nucleus+DP1*:E2F1@nucleus
(2) DP1*:E2F1:SWI/SNF:pRB*__pho__pho@nucleus - CDK2_Thr160_pho:cyclin E1*@nucleus -?> DP1*:E2F1:pRB*__pho__pho__pho@nucleus+SWI/SNF__pho@nucleus