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Another known consequence of the activation of PKC and subsequent activation of ERK kinase is activation of the transcription factor activator protein-1 ( AP-1 ).
 AP-1, transcription factor activator protein-1, ERK kinase, 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:
 AP-1, transcription factor activator protein-1, ERK kinase, PKC