thyroid gland molecular composition trait thyroid gland ribonucleic acid amount VT:0011056 caripark 2023-07-12T20:40:04Z thyroid gland RNA amount CMO:0003259 Trait.ontology The proportion, quantity, or volume of ribonucleic acid in the thyroid gland, a two-lobed endocrine gland found in all vertebrates, located in front of and on either side of the trachea in humans, that produces various hormones, such as triiodothyronine and calcitonin. Ribonucleic acid is a high molecular weight, linear polymer composed of nucleotides containing ribose and linked by phosphodiester bonds.