9449
When the high affinity hnRNP A1 binding site was inserted into the beta - globin reporter , Rev was able to increase the cytoplasmic levels of unspliced mRNAs to 14 % .
 hnRNP A1 binding site, beta - globin reporter, Rev
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 hnRNP A1 binding site, beta - globin reporter, Rev