19811
Recently , we reported on the ability of a series of small molecule , cyclic polyamine disulfides to condense and cage plasmid DNA ( pDNA ) by a process of thermodynamically controlled template polymerization , leading to a series of corresponding pDNA - polyplex nanoparticles able to mediate high levels of transfection with no associated cytotoxicities .
 Chemical: cyclic polyamine disulfides
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
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Answer:
 Chemical: cyclic polyamine disulfides