21881
The lymphatic pharmacokinetics of interferon alpha 2b ( IFN , 19kDa ) and PEGylated interferon alpha 2b ( IFN - PEG12 , 31kDa ) or alpha 2a ( IFN - PEG40 , 60kDa ) was examined in thoracic lymph duct cannulated rats .
 Chemical: PEG12; Chemical: PEG40
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: PEG12; Chemical: PEG40