AR and Infertility: A complete mutation (CAG repeats, n ≥ 42) in exon 1 of the AR gene, characteristic of spinal and bulbar muscular atrophy (SBMA), was found in three patients (all of whom had developed SBMA at the time of examination); and in three infertile men the number of repeats was n = 39–41 (with no diagnosed SBMA at the time of examination) (Figure 1).