5471
Using an RNase H - mediated mapping technique , we show that the 64 - kDa subunit of CstF can be photo cross - linked to pre - mRNAs at U - rich regions located downstream of the cleavage site of the simian virus 40 late and adenovirus L3 pre - mRNAs .
 RNase H, CstF, adenovirus L3 pre - mRNAs
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 RNase H, CstF, adenovirus L3 pre - mRNAs