Melatonin in humans-where we are 40 years after its discovery.
: Although the pineal gland was well known for more than 2000 years and has been documented since Galen (130-200 AD), for many centuries different theories concerning its function were presented. The organ was believed to be a sphincter (ancient Greeks), the point at which the soul preeminently controls the body (Descartes, 1596-1650), .....