1427
Increased expression of the c-jun protooncogene and an increase in AP-1 binding activity in PKC-zeta cells provides a potential mechanism for explaining the altered differentiation status of this cell.
 AP-1, c-jun, PKC-zeta cells, PKC-zeta
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, c-jun, PKC-zeta cells, PKC-zeta