6687
Furthermore , addressability of the functional groups has been proven , for example , by coupling with fluoresceine isothiocyanate ( FITC ) , to allow for optical monitoring of the nanoparticle fate in biological systems .
 Chemical: fluoresceine isothiocyanate; Chemical: FITC
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: fluoresceine isothiocyanate; Chemical: FITC