pineal gland ribonucleic acid amount The proportion, quantity, or volume of ribonucleic acid in the pineal gland, the midline, cone-like structure located in the dorso-caudal roof of the third ventricle, attached by peduncles to the habenular and posterior commissures, which produces melatonin. Ribonucleic acid is a high molecular weight, linear polymer composed of nucleotides containing ribose and linked by phosphodiester bonds. Trait.ontology 2023-06-30T11:01:12Z pineal body RNA amount VT:0011038 CMO:0003307 pineal gland RNA amount pineal body ribonucleic acid amount caripark pineal gland molecular composition trait