These findings were somewhat expected because Mauritania is located at the intersection between Maghreb and sub-Saharan African countries, and its ethnic composition is made up of Moors of Arab descent, in whom Mediterranean G6PD variant B- (563T) predominates, and black Africans in whom G6PD deficiency is mostly due to G6PD A- variant. Here, G6PD is linked to hyperinsulinemic hypoglycemia, familial, 4.