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. Author manuscript; available in PMC: 2022 Aug 1.
Published in final edited form as: Expert Opin Pharmacother. 2021 Apr 7;22(12):1625–1632. doi: 10.1080/14656566.2021.1912015

Figure 1.

Figure 1.

Mechanism of PAPRPi in cancer. PARP: Poly (ADP-ribose) polymerase HRR: Homologous recombination repair. PARP is a key protein in repairing single-strand DNA breaks. If the cell has lost PARP function then the single-strand breaks accumulate leading to double-strand DNA breaks. If the HRR repair pathway is nonfunctional then the cell undergoes apoptosis.