Origin of Afferent Projections into Bovine Chromaffin Cell Implants in the Rat Periaqueductal Gray Determined by Retrograde and Anterograde Tracing

摘要

We have previously described long-termsurvival of isolated bovine chromaffin cellsuspension grafts in the periaqueductal gray ofadult rats. Electron microscopic analysis of thegraft sites revealed synapses on the transplantedchromaffin cells. The origin of these synapses isnot known, but they are probably derived fromthe host since the initial grafts were suspensionsof chromaffin cells that were essentially free ofother cell types.