Figure 5

TH-IR and PGP 9.5-IR neurons and axons in the ICG in the atria: Double-labeled. All TH-IR axons and neurons were also positive for PGP 9.5. A few TH-IR neurons were present. ICG intrinsic cardiac ganglia, PGP 9.5 protein gene product 9.5. Arrows indicate the axons and neurons that were dual labeled with TH and PGP 9.5.