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In vitro MTT assay showed that ATO remarkably reduced the viability of cultured cardiac fibroblasts ( NRCFs ) from neonatal rat in a concentration - and time - dependent manner .
 Chemical: MTT; Chemical: ATO
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: ATO