21099
Electrophilic chemicals activate both insect and vertebrate TRPA1 via covalent modification of cysteine residues in the amino - terminal region .
 Chemical: cysteine; Chemical: amino
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: amino