Fig. 2: The stellate ganglion received projections from the locus coeruleus.

A, B Schematic of the pseudorabies virus (PRV) retrograde tracing experiment. C Representative images of PRV-expressing neurons in the locus coeruleus (LC); scale bar: 50 μm. D Representative fluorescence images of noradrenergic neurons in the LC; scale bar: 50 μm. E Representative images of PRV-expressing (green) and noradrenergic neurons (red) in the LC; scale bar: 50 μm.