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Carriers optimized for siRNA delivery. dithiodipropionic acid di(N-succinimidyl ester) (DSP) linked with free amines on the surface of HDO/siRNA polyplex (29). Active three-arm structure 386 and its inactive analogue 387 (28, 97). Lipooligomer EHCO (122) with histidine, cysteine, and oleic acid (OleA). Active t-shaped polymer 49 and its inactive analogue 216 (28).
