2641
This inhibition was not mediated through Nef phosphorylation on Thr-15 or GTP -binding activity because mutations in critical sites did not alter this inhibition.
 Nef
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:
 Nef