5752
However , no soluble ADH5 protein could be heterologously expressed in Escherichia coli cells with expression systems successfully used for other mammalian ADHs , including fused to glutathione - S - transferase .
 glutathione, S
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 glutathione, S