2140
S1 nuclease analysis of RNA prepared after transfection of these HIV constructs into HeLa cells infected with wild - type adenovirus indicated that the enhancer , SP1 , TATA , and a portion of the transactivation - responsive element were each required for complete E1A / E1B - mediated activation of the HIV LTR .
 S1 nuclease, SP1, E1A, E1B, HIV LTR
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 S1 nuclease, SP1, E1A, E1B, HIV LTR