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A Novel Automethylation Reaction in the Aspergillus nidulans LaeA Protein Generates S - Methylmethionine .
 Chemical: S - Methylmethionine
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 - Methylmethionine 
Answer:
 Chemical: S - Methylmethionine