5488
The v - ets oncogene of the avian retrovirus E26 differs from its cellular progenitor p68c - ets - 1 by two amino acid substitutions ( alanine 285 and isoleucine 445 in c - ets - 1 both substituted by valine in v - ets , mutations A and B respectively ) and its carboxy - terminal end ( mutation C ) .
 v - ets oncogene, p68c - ets - 1, c - ets - 1, v - ets
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 v - ets oncogene, p68c - ets - 1, c - ets - 1, v - ets