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A particular focus of the present review will be on the function of recently identified genes of the Met salvage cycle or Yang cycle and the importance of the Met salvage cycle in the metabolism of MTA ( 5 ' - methylthioadenosine ) .
 Met, Met, MTA, 5 ' - methylthioadenosine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Met, Met, MTA, 5 ' - methylthioadenosine