SMN2 and spinal muscular atrophy, type II: Likewise, only 33.4% of the total have a count of SMN2 copies and the data reported in this regard should be taken with caution since the majority of patients with SMA type 2 report having a considerable percentage of 2 copies of SMN2 (30.7%), which is discordant for the habitual genotype–phenotype correlation of the disease described in the international literature and that studied by another Argentine group (13).