5568
MHC class II density on the APC was modified using DQ2 homo -and hetero zygous B-LCLs as APCs , however this variation of MHC concentration had no effect on T cell proliferation .
 MHC class II, APC, APCs, T cell
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:
 MHC class II, APC, APCs, T cell