2849
Upon transfection into Nb2 T cells , 1.7 kilobases (kb) of IRF-1 5'-flanking DNA linked to a chloramphenicol acetyl transferase ( CAT ) reporter gene mediated a 30-fold induction of CAT enzyme activity in response to 24 h of PRL stimulation .
 chloramphenicol acetyl transferase ( CAT ) reporter gene, chloramphenicol acetyl transferase, IRF-1, CAT, IRF-1 5'-flanking DNA, CAT enzyme, CAT, Nb2 T cells, PRL
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:
 chloramphenicol acetyl transferase ( CAT ) reporter gene, chloramphenicol acetyl transferase, IRF-1, CAT, IRF-1 5'-flanking DNA, CAT enzyme, CAT, Nb2 T cells, PRL