In some non-mammalian vertebrates, this gland produces the phototransducive melanopsin, lending credence to the theory that he cells of this structure are related to those in the retina.
This structures namesake cells contain 5-HT acetyltransferase and 5-hydroxyindole-O-methyltranferase, which are used to convert serotonin into another product. This structure's cells are easily identified by the unique presence of the synaptic ribbon and are present in lobules along with astrocytes.  In some non-mammalian vertebrates, this gland produces the phototransducive melanopsin, lending credence to the theory that he cells of this structure are related to those in the retina. Though the mechanism is unclear, calcification and fluoridation of this structure takes place with age and markedly reduces this gland's ability to synthesize melatonin. For ten points, identify this pine-cone shaped endocrine gland.
This structures namesake cells contain 5-HT acetyltransferase and 5-hydroxyindole-O-methyltranferase, which are used to convert serotonin into another product.
{Pineal gland }or {epiphysis}