Rb -> pRb
RbE2f -> E2f + pRb
pRb -> Rb
0 -> E2f
E2f -> 0
RbE2f -> Rb
E2f + Rb <-> RbE2f
0 -> P21
E2f -> Ce + E2f
E2f -> Ca + E2f
Ce + P21 <-> CeP21
Ca + P21 <-> CaP21
CeP21 -> Ce
CaP21 -> Ca
Ce -> 0
CeP21 -> P21
Ca -> 0
CaP21 -> P21
P21 -> 0
E2f -> E1 + E2f
E1 -> 0
C1 + E1 <-> E1C1
E1C1 -> C1
C1 -> pC1
E1C1 -> E1 + pC1
pC1 -> C1
0 -> aPcna
aPcna -> 0
iPcna -> P21
P21 + aPcna <-> iPcna
iPcna -> aPcna
aPcna + pRc <-> aRc
iPcna + pRc <-> iRc
Rc -> pRc
pRc -> Rc
P21 + aRc <-> iRc
iRc -> aRc
Rc -> 0
pRc -> 0
aRc -> aPcna
iRc -> iPcna
aRc -> Dna + aRc
0 -> P53
P53 -> 0
0 -> Dam
aRc -> Dam + aRc
0 -> Pr
Pr -> 0
Dam -> 0