Lefebvre et al. reported in their SMN1 discovery paper that amplification of exon 7 to exon 8 in a patient with SMA type III resulted in a product carrying the SMN2 exon 7 and SMN1 exon 8 sequences, suggesting the possibility of a gene conversion event in this patient [12]. The gene discussed is SMN1; the disease is spinal muscular atrophy, type III.