a severe regression occurred. We identified a novel homozygous protein-truncating variant in the NAPB (N-ethylmaleimide-sensitive fusion [NSF] attachment protein beta) gene that encodes the βSNAP protein, . et al. 0 a key regulator of NSF-adenosine triphosphatase. This enzyme is essential for synaptic transmission by disassembling and recycling proteins of the SNARE complex. Here - issue: - volume: - pages: .