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To elucidate how PSP affects immune populations , we compared PSP treatments both with and without prior incubation in phytohaemagglutinin ( PHA ) - a process commonly used in immune population experimentation .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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