Biodegradable PEG copolymers with oligopeptides Polyglutamic Acid and PLL (PolyL-lysine);  PLA (polylactic acid); PCL (polycaprolactone); PGA (PolyGlycolide), or PLGA (Poly(lactic-co-glycolic acid). More information on: https://www.jenkemusa.com/biodegradable-polymers . Please contact us for details.