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pDNA carrier polymers based on artificial amino acids. There is no gene transfer activity for small structures without cysteines such as compound 23 (98). Structures 51,74,78,82 with two cysteines (98) for linear linking profit from longer cationic binding regions. 519 (92) presents cross-linking ability in a four-arm structure with a longer diaminoethane motif (Sph).
