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The aim of this study was to evaluate the protective effects of 4 - thujanol against the genotoxic effects induced by mitomycin C ( MMC ) and cyclophosphamide ( CP ) in human lymphocytes , using the chromosome aberrations , sister chromatid exchanges , and micronucleus tests , in the absence and in the presence of S9 mix , respectively .
 Chemical: 4 - thujanol; Chemical: mitomycin C; Chemical: MMC; Chemical: cyclophosphamide
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: 4 - thujanol; Chemical: mitomycin C; Chemical: MMC; Chemical: cyclophosphamide