1788
TREB7 and TREB36 protected all three repeats of the 21 bp , but TREB5 protected only the second repeat .
 TREB7, TREB36, TREB5
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 TREB7, TREB36, TREB5