brain ribonucleic acid amount forebrain molecular composition trait forebrain ribonucleic acid amount 2025-12-02T22:08:19Z Trait.ontology CMO:0003369 VT:0011259 The proportion, quantity, or volume of ribonucleic acid in the part of the brain developed from the most rostral of the three primary vesicles of the embryonic neural tube from which the diencephalon and telencephalon are derived. Ribonucleic acid is a high molecular weight, linear polymer composed of nucleotides containing ribose and linked by phosphodiester bonds.