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Although methionine dependency is a phenotypic characteristic of tumor cells , the role of sulfur amino acid metabolism in chemotherapy resistance remains to be elucidated .
 Chemical: methionine; Chemical: sulfur; Chemical: amino acid
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: methionine; Chemical: sulfur; Chemical: amino acid