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Poly-Lysines (PLYs) are a class of poly(amino acids) that are a valuable alternative to PEG. Unlike PEGs, polylysines are biocompatible and biodegradable, so they don’t accumulate in the body or cause an immune response, which is a known issue with larger PEGs. PLYs can be used as carriers for pharmaceuticals, or for the multivalent presentation of molecules.