Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
SMN2 gene copy number by spinal muscular atrophy (SMA) type. Distributions of SMN2 gene copy numbers observed in the 2018 Cure SMA survey (among those with valid responses) and those reported in a recent analysis by Calucho et al., 2018 [58] for each SMA type.
