17726
Structural insights into the recovery of aldolase activity in N - acetylneuraminic acid lyase by replacement of the catalytically active lysine with gamma - thialysine by using a chemical mutagenesis strategy .
 Chemical: N - acetylneuraminic acid; Chemical: lysine; Chemical: gamma - thialysine
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: N - acetylneuraminic acid, lysine, gamma - thialysine 
Answer:
 Chemical: N - acetylneuraminic acid; Chemical: lysine; Chemical: gamma - thialysine