2578
Deletion constructs of the pCD41 clone demonstrated that ORF-A was critical for the HIV LTR activation.
 pCD41 clone, pCD41, ORF-A, HIV LTR
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:
 pCD41 clone, pCD41, ORF-A, HIV LTR