9306
Whereas , there were no significant differences among the PKC inhibitors , caffeine , and PKC inhibitors + caffeine groups .
 Chemical: caffeine; Chemical: caffeine
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: caffeine; Chemical: caffeine