1819
However , differential utilization of these determinants mediate RAR - RXR heterodimer binding to DR - 2 and DR - 5 RAREs .
 GENE: RAR; GENE: RXR
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: RAR; GENE: RXR