22866
CD68 immunolabeling revealed 31 % , 47 % and below 4 % microparticle uptake by macrophages 1week , 1month , and 3months after injection , respectively ( P < 0 . 001 ) .
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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