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Cytotoxicity was evaluated by the MTT assay and PQ intracellular concentrations were measured by gas chromatography - ion trap - mass spectrometry ( GC - IT - MS ) .
 Chemical: MTT
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