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In vivo modification of major histocompatibility complex class II DRA promoter occupancy mediated by the AIR-1 trans-activator .
 major histocompatibility complex class II, major histocompatibility complex class II DRA promoter, AIR-1 trans-activator
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:
 major histocompatibility complex class II, major histocompatibility complex class II DRA promoter, AIR-1 trans-activator