1729
Inhibition of activation of transcription factor AP-1 by CD28 signalling in human T-cells .
 AP-1, human T-cells, transcription factor AP-1, CD28
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, human T-cells, transcription factor AP-1, CD28