Albright hereditary osteodystrophy (AHO) is a disorder caused by heterozygous inactivation of GNAS, which encodes the α-subunit of the stimulatory G protein (Gαs) and couples heptahelical receptors to stimulate adenylyl cyclase [1–7]. This evidence concerns the gene GNAS and pseudohypoparathyroidism type 1A.