5507
The phosphorylation of H2AX ( gamma H2AX ) , a marker of double strand DNA breaks ( DSBs ) , was increased by all the winter fractions on A549 and THP - 1 cells while summer PM samples did not induced this effect .
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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