1683
These findings suggest a molecular mechanism of positive regulation of PAFR gene expression by PAF through NF-kappa B , possibly by a phosphorylation reaction involving protein kinase C by PAF .
 PAF, NF-kappa B, PAFR, PAF, protein kinase C
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:
 PAF, NF-kappa B, PAFR, PAF, protein kinase C