3718
A mammalian protein called RFX or NF - X binds to the X box ( or X1 box ) in the promoters of a number of major histocompatibility ( MHC ) class II genes .
 GENE: RFX; GENE: NF - X; GENE: major histocompatibility ( MHC ) class II genes
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: GENE 
Text: {0} 
Answer:
 GENE: RFX; GENE: NF - X; GENE: major histocompatibility ( MHC ) class II genes