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In addition , we found that presence of a polyamine such as spermidine has no notable effect in the incision activity of ApeI enzyme in linear oligomer DNA duplexes in our experimental concentration .
 Chemical: polyamine; Chemical: spermidine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: polyamine; Chemical: spermidine