1631
This locus encodes a transcriptional trans-activator required for the constitutive expression of major histocompatibility complex (MHC) class II genes .
 ( DNA: major histocompatibility complex (MHC) class II genes, None) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: RNA,cell type,protein,cell line,DNA, Arguments type: . 
Text: {0} 
Answer:
 ( DNA: major histocompatibility complex (MHC) class II genes, None) 