diaphragm molecular composition trait diaphragm ribonucleic acid amount 2026-01-08T16:56:59Z Trait.ontology CMO:0003308 The proportion, quantity, or volume of ribonucleic acid in the thin musculomebranous barrier that separates the abdominal and thoracic cavities; often used for breathing control. Ribonucleic acid is a high molecular weight, linear polymer composed of nucleotides containing ribose and linked by phosphodiester bonds. VT:0011268