21556
Therefore , we propose a mechanism whereby the oxo - acids generated after oxidation of the cysteine thiol cause an electrostatic repulsion , thus preventing specific DNA binding .
 Chemical: oxo - acids; Chemical: cysteine thiol
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: oxo - acids; Chemical: cysteine thiol