forebrain morphology trait brain molecular composition trait forebrain molecular composition trait 2025-12-02T22:08:09Z VT:0011258 Trait.ontology Any measurable or observable characteristic related to the proportions of proteins, minerals, nutrients, gases, or other substances 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.