Their first discovery was a mutation of the DEC2 gene, which plays a role in regulating a wakefulness hormone called orexin.
http://cadviag.com/ - purchasing viagra in usa Two variants known to cause HSAN1 were identified as causal for macular telangiectasia type 2: of 11 patients with HSAN1, 9 also had macular telangiectasia type 2.