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Poly-ornithines (PORs) are a class of poly(amino acids) that are a valuable alternative to PEG. Poly-ornithines are biocompatible and biodegradable, so they do not accumulate in the body or cause an immune response. PORs can be used as carriers for pharmaceuticals, or for the multivalent presentation of molecules. This selection offers PORs of different lengths, from 20 to 200 ornithine units.