1495
This study was designed to investigate the functional significance of previously described mutations in the viral long terminal repeat ( LTR ) and to elucidate their contribution to the unique phenotype of SIVsmmPBj14 .
 LTR, viral long terminal repeat
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:
 LTR, viral long terminal repeat