4767
To date, a large number of receptors for IL-12 have been found only on PBMC following activation with PHA or IL-2 .
 PBMC, PHA, IL-12, IL-2
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:
 PBMC, PHA, IL-12, IL-2