6591
TCR affinities were then indirectly estimated by blocking CD8 interaction with an anti-CD8 mAb .
 CD8, anti-CD8 mAb, TCR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: cell line, protein, RNA, DNA, cell type 
Text: {0} 
Answer:
 CD8, anti-CD8 mAb, TCR