UCN and infection: Despite the existence of a direct projection from EWcp to the spinal cord described in several studies using monosynaptic tracers and the presence of Ucn-1 fibers (likely arising from EWcp) in several spinal cord laminae, nearly all PRV studies of sympathetically innervated targets in rats and mice reported that the infection in EWcp is delayed with respect to the infection of presympathetic areas.