EPHX2 and Huntington disease: G-4 genes included 6 genes: Btg3 associated nuclear protein (Banp), Ephx2, retinoid X receptor gamma (Rxrg), Ryr1, RNA-binding protein fox-1 homolog 1 (Rbfox1) and Zbtb16 categorized as ‘hereditary disorder (Huntington's disease)' (Table IV, G-4) (31–33).