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Number of myenteric ganglion units in the thoracic esophagus and stomach. Rats with megaesophagus (ME+) have significantly less neuronal nitric oxide synthase (nNOS)–staining myenteric ganglion units in the esophagus than normal rats (ME−) but equivalent numbers in the stomach; n = 5 in each group (**P < .01). hpf, high-power field.
