| The pineal gland in the brain secretes melatonin, which has been linked to depression. |
| Melatonin and serotonin are indoleamines derived from tryptophan which are produced by the pineal gland in vertebrates. |
| The pineal gland is thought to be involved in the maintenance of daily and seasonal biorhythms as well as in the timing of reproduction. |
| The tumor was located in the pineal gland and was well demarcated from the surrounding brain tissue, especially from the cerebellum. |
| The pineal gland hormone, melatonin, is one of the endproducts regulated by the circadian system. |
| Melatonin is a hormone that is naturally secreted in the evening from the pineal gland in the brain and tells the brain it is time to sleep. |
