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Fig. 9. Micrographs (left) and schematic drawings (right) of cross sections of the anterior cardiac nerve (ACN) treated with (A) anti-GABA ({gamma}-aminobutyric acid) antibody or (B) anti-Glu (glutamate) antibody. A and B are neighbouring sections. In A, one GABA-like immunoreactive axon profile is seen. In B, one strong and one weak (the hatched axon in the schematic drawing indicates the weak profile) Glu-like immunoreactive axon profile is seen. Scale bar, 5 µm. CI, cardioinhibitory nerve; VE, valve excitatory nerve.