26302
C47 of GSTP1 - 1 is S - nitrosated in two steps , with the chemical step limited by a pre - equilibrium between the open and closed conformations of helix alpha 2 at the active site .
 Chemical: S
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: S 
Answer:
 Chemical: S