30181
Peripheral blood mononuclear cells from healthy donors were incubated with purified TSST - 1 , or with the T cell mitogen phytohaemmaglutinin ( PHA ) , and proliferation measured .
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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:
 None