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When the MC26 cells were transplanted to their immune - competent Balb / c mice , methylselenol - treated MC26 cells had significantly less tumor growth potential than that of untreated MC26 cells .
 methylselenol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 methylselenol