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Knockdown of PHF6 impairs cell proliferation and arrests cells at G ( 2 ) / M phase , which is accompanied by an increased level of phosphorylated H2AX , indicating that PHF6 deficiency leads to the accumulation of DNA damage in the cell .
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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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