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Fig. 10. Photographs of CI axons in whole-mount preparations and paraffin sections of the heart. (A) A pair of bilateral CI axons, which show GABA-like immunoreactivity, join the cardiac ganglion in a whole-mount preparation. (B) A CI axon running in the trunk of the cardiac ganglion showed GABA-like immunoreactivity in a paraffin section. Scale bar, 50 µm. The diagram shows the areas depicted in A and B.