Poly ADP Ribose (PAR) is a polymer synthesized by the enzyme poly(ADP-ribose) polymerase (PARP). It plays a crucial role in cellular processes such as DNA repair, genomic stability, and programmed cell death. The polymer is made of multiple adenosine diphosphate ribose units linked together, which are derived from NAD+. PAR is involved in post-translational modification of proteins, influencing their function in various cellular mechanisms.
