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To investigate the combined toxic effects of pesticide cocktails previously identified in the French diet , we first studied the cytotoxicity induced by seven cocktails composed of two to six pesticides on human hepatic ( HepG2 ) and colon ( Caco - 2 ) cell lines using the MTT and neutral red uptake assays .
 Chemical: MTT; Chemical: neutral red
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: MTT; Chemical: neutral red