20194
In vivo studies of ( 18 ) F - 6b were performed which illuminated this agent as an improved probe for molecular imaging of TSPO - expressing cancers .
 Chemical: ( 18 ) F
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: ( 18 ) F