2082
Cysteines are thought integral to conformational epitopes of islet antigen - 2 ( IA - 2 ) autoantibodies ( IA - 2A ) , possibly through disulfide bond formation .
 Chemical: Cysteines; Chemical: disulfide
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: Cysteines; Chemical: disulfide