8663
CS - PEG - Biotin NCs , displaying biotin tags at their surface , were obtained and efficiently functionalized with an anti - TMEFF - 2 mAb through a convenient avidin - biotin approach .
 Chemical: PEG; Chemical: Biotin; Chemical: biotin; Chemical: biotin
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: PEG; Chemical: Biotin; Chemical: biotin; Chemical: biotin