1391
Thus , the biochemical in vitro effects of PKM zeta inhibitors correspond with their intracellular effects , and ZIP and chelerythrine , together with scrambled ZIP and staurosporine as controls , are effective tools to examine the function of PKM zeta in neurons .
 ZIP, chelerythrine, ZIP, staurosporine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Chemical 
Text: {0} 
Answer:
 ZIP, chelerythrine, ZIP, staurosporine