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T cells express multiple isotypes of protein kinase C ( PKC ) and although it is well accepted that PKCs have an important role in T cell activation , little is known about the function of individual PKC isotypes .
 protein kinase C, PKC isotypes, PKCs, T cells, PKC
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, PKC isotypes, PKCs, T cells, PKC