25571
In vivo administration of Ad / chitosan - PEG or Ad / chitosan - PEG - FA into mice demonstrated that PEGylation greatly increased blood circulation time , resulting in 9 . 0 - fold and 48 . 9 - fold increases at 24h after injection compared with naked Ad , respectively .
 Chemical: PEG; Chemical: PEG - FA
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
 Entities: PEG, PEG - FA 
Answer:
 Chemical: PEG; Chemical: PEG - FA