14436
When ligated to the proIL-1 beta cap site -proximal region (located between -131 to +12), both the proIL-1 beta and the simian virus 40 enhancer elements functioned more efficiently in monocytes than in HeLa cells , which are not normally competent for IL-1 beta expression .
 proIL-1 beta, cap site, -proximal region, IL-1 beta, monocytes, proIL-1 beta cap site, HeLa cells
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:
 proIL-1 beta, cap site, -proximal region, IL-1 beta, monocytes, proIL-1 beta cap site, HeLa cells