. "At the beginning of this reaction, 1 molecule of 'phospho-Retinoblastoma protein', and 1 molecule of 'RNA primer-DNA primer:origin duplex with DNA damage' are present. At the end of this reaction, 1 molecule of 'Rb1:RNA primer-DNA primer:origin duplex with DNA damage' is present.

This reaction takes place in the 'nucleus' and is mediated by the 'phosphoprotein phosphatase activity' of 'PP2A'.
"^^ . . . . . . . "PP2A mediated localization of RB1 protein in chromatin"^^ . "3.1.3.16"^^ . . . .