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The new cyclic hexa - and octa - amine disulfides prove more effective at transfection in vitro , especially of lung epithelial A549 cell line .
 Chemical: cyclic hexa - and octa - amine 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 hexa - and octa - amine disulfides