21984
Clearance from the skin after intradermal injections was initially fast ( t1 / 2 0 . 62h , k 1 . 1179h ( - 1 ) ) , followed by a slower steady decrease after 6h .
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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:
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