Poly(ADP-ribose) (PAR) is a highly charged, intrinsically flexible nucleic-acid-like homopolymer composed of ADP-ribose units. It serves as a critical post-translational modification that is rapidly synthesized in response to DNA damage and participates in diverse important cellular processes, including DNA repair, chromatin remodeling, and RNA biogenesis, often by promoting biomolecular phase separation. However, PAR's conformational heterogeneity coupled with limited experimental characterizat