2897
Treatment of T cells with the protein kinase C activator PMA in combination with Ca2+ ionophores mimics this process, and the two agents are often substituted for TCR stimulation , bypassing the TCR .
 protein kinase C, T cells, TCR, TCR
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, T cells, TCR, TCR