21983
Topical BPV - IFN alpha treatment resulted in maximum skin levels ( about 100 , 000U / 100cm ( 2 ) ) of IFN alpha within 6h and maintained for 72 - 96h .
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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