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Protein kinase C ( PKC ) , a widely - distributed enzyme implicated in the regulation of many physiological processes , consists of a family of at least twelve isoenzymes which differ in tissue distribution , subcellular localization , regulatory properties , etc .
 Protein kinase C, PKC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 Protein kinase C, PKC