3614
Newer definitions of oxidative stress focus on the targeted redox modification of cysteine / thiol functional groups found in the regulatory domains of critical signaling pathway proteins , suggesting that the targeted disruption of signaling through specific redox couples may account for the specificity of teratogen - induced malformations which previously could not be rationalized .
 Chemical: cysteine; Chemical: 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: cysteine; Chemical: thiol