4075
A construct termed PFP5a containing -795 bp exhibited the highest CAT activity , and PFP9a20 containing only -73 bp also produced significantly high CAT activity in CTLL-R8 cells .
 PFP5a, PFP9a20, CAT, -795 bp, CAT, CTLL-R8 cells, -73 bp
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:
 PFP5a, PFP9a20, CAT, -795 bp, CAT, CTLL-R8 cells, -73 bp