(center map)
(1) DP1*@cell - E2F1@nucleus -t-> DP1*@nucleus
(2) E2F1@nucleus+DP1*@nucleus -> DP1*:E2F1@nucleus
(3) E2F1__pho@nucleus -> E2F1@nucleus
(4) E2F1@nucleus+p14ARF*@nucleus -> E2F1:p14ARF*@nucleus
(5) E2F1@nucleus - p14ARF*@nucleus ->
(6) E2F1@nucleus - TFIIH*@nucleus -> E2F1_Ser403_pho@nucleus
(7) E2F1@nucleus -?> E2F Family@cell