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The biofilms exposed only to TCS recovered far better than those subjected to both altered flow and subsequent TCS exposure : the latter suffered more persistent consequences , indicating that simulated drought amplified the toxicity of this compound .
 TCS, TCS
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 TCS, TCS