5121
In both cell lines Merle 23 induced a pattern of transcription largely like that of phorbol ester although with a modest reduction at later times in the LNCaP cells , suggesting that the difference in biological response of the two cell lines to Merle 23 lies downstream of this transcriptional regulation .
 Merle 23, phorbol ester, Merle 23
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 Merle 23, phorbol ester, Merle 23