3819
In addition, JNK activation by PMA plus ionophore was sensitive to inhibitors of signaling pathways involving Ca2+ , protein kinase C , and tyrosine phosphorylation, which failed to inhibit the activation mediated by PDTC .
 protein kinase C, JNK
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:
 protein kinase C, JNK