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The presence of MTX and its metabolites was also assessed in vivo through the analysis of liver and heart extracts of MTX - treated rats .
 Chemical: MTX; Chemical: MTX
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: MTX; Chemical: MTX