24580
Mice in both groups were divided into five subgroups ( n = 6 per subgroup ) and sacrificed at 1 , 2 , 3 , 6 , and 12 months post - RI administration .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 None