23262
We identified a cysteine substituted mutant GABAA receptor with unique characteristics allowing determination of allosteric agonist site occupancy in both inactive and active receptors .
 Chemical: cysteine
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: cysteine 
Answer:
 Chemical: cysteine