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By contrast , our original cyclic tetra - amine disulfide remains the most efficient agent for the transfection of lung epithelial cells in vivo following intra - nasal administration .
 Chemical: cyclic tetra - amine disulfide
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
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Answer:
 Chemical: cyclic tetra - amine disulfide