In Arab countries in the Middle East, the Mediterranean-type G6PD B– deficiency predominates over other types of G6PD deficiencies, but in a small minority of G6PD deficient Arab patients (generally < 2%, similar to the proportion found in Mauritanian white Moors), the deficiency is associated with the African-type G6PD A– [92–94]. This evidence concerns the gene G6PD and hyperinsulinemic hypoglycemia, familial, 4.