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The most striking effect of combining T + PCPA was a significant increase in attack frequency as well as a significant decrease in the latency to attack , particularly following physical provocation .
 Chemical: T; Chemical: PCPA
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Chemical: T; Chemical: PCPA