13610
Anti-CD40 + IL-4 -mediated proliferation of PBMC and B cells was inhibited by RA in a dose-dependent manner , with maximal inhibition of 62% +/- 5% in PBMC and 55% +/- 4.4% in B cells by all-trans RA , and 58% +/- 6.7% and 51% +/- 4.7%, respectively by 13-cis RA .
 IL-4, Anti-CD40, B cells, PBMC, B cells, PBMC
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:
 IL-4, Anti-CD40, B cells, PBMC, B cells, PBMC