4661
In this report we describe the isolation of a Fab fragment ( Fab A8 ) showing a high relative affinity for the receptor ( 0 . 5 nM ) .
 Fab fragment, Fab A8
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Fab fragment, Fab A8