41. The first pair are small protein hormones, secreted by the pineal gland and posterior pituitary gland respectively. 42. The pineal gland in the brain produces melatonin when our eyes register darkness, and tells us it's bedtime. 43. As he is about to eat her brain, she bites off his pineal gland , reverting him to his senses. 44. Signals travel from the master clock to the pineal gland and other centers that release hormones throughout the body. 45. Blue light, emitting at wavelengths of 400 500 nanometers, suppresses the production of melatonin produced by the pineal gland . 46. :: The pineal gland is historically a third eye, and was active as a light sensor in early fish. 47. Melatonin is produced only at night by the pineal gland , a pea-size organ in the center of the brain. 48. The association says one possible cause is melatonin, a sleep-related hormone secreted by the pineal gland in the brain. 49. The miracle stuff I bought is melatonin, a naturally occurring hormone secreted by the pineal gland , a tiny mid-brain structure. 50. See pineal gland for a homologous organ in vertebrates . talk ) 23 : 09, 14 September 2012 ( UTC)
