Is inducible nitric oxide synthase polymorphism associated with susceptibility to Henoch-Schönlein purpura in northwestern Spain?
Significant differences in the NOS2A promoter polymorphism allele and genotype frequency between HSP patients and controls suggest a potential role for this gene in the susceptibility to HSP and in the development of nephritis.
Nasal cycle duration during sleep is longer than in wakefulness. Changes in laterality of nasal cycle frequently coincide with switches in posture, tend to occur in REM sleep, never occur in slow-wave sleep, and may be absent in subjects with severe nasal septal deviations.