“…Indeed, 5‐HT 4 seems to play a fundamental role in GI physiology and seems to be a promising pharmacological target for equine GI disorders . In addition, we investigated 5‐HT 4 expression in visceral extrinsic sensory nerves by analyzing spinal ganglion neurons from healthy horses and intestinal tissues from foals with lethal white foal syndrome (LWFS), i.e., ileocolonic aganglionosis, reminiscent of Hirschsprung's disease in humans …”