4038
H2AX is thought to operate primarily through its C - terminal S139 phosphorylation , which mediates the recruitment of DNA damage response ( DDR ) factors to chromatin at DSB sites .
 Chemical: C
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: C