536
During a 28 - week promotion bioassay , groups of 30 male CD - 1 mice were treated once with 50 microliter of either DMBA ( 1 . 0 mg / ml ) or acetone , rested for 2 weeks , and then treated twice per week with test material for the remaining 25 weeks .
 None
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 None