4812
After cells were stably transfected with CIITA , endogenous MHC class II genes were constitutively expressed , and MHC class II promoters , delivered by transfection , were actively transcribed in CIITA - expressing cells .
 CIITA, MHC class II genes, MHC class II promoters, CIITA
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 CIITA, MHC class II genes, MHC class II promoters, CIITA