21175
In particular , nitrosylation promoted disulfide formation involving the pair of catalytic cysteines ( Cys - 52 and Cys - 173 ) and disrupted the oligomeric structure of Prx1 , leading to loss of peroxidase activity .
 disulfide, cysteines, Cys, Cys
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 disulfide, cysteines, Cys, Cys