21549
While most CRP - family members are co - regulated by effector molecules , the activity of FixK2 is negatively controlled by oxidation of its single cysteine ( C183 ) located next to the DNA binding domain , and possibly also by proteolysis .
 Chemical: cysteine
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