cartilage morphology trait cartilage molecular composition trait 2025-10-22T12:41:58Z VT:0011233 Trait.ontology Any measurable or observable characteristic related to the proportions of proteins, minerals, nutrients, gases, or other substances in the nonvascular, resilient, flexible connective tissue found primarily in joints, walls of the thorax, and tubular structures, but which also comprises most of the skeleton in early fetal life; some species have skeletons that are completely composed of cartilage which is never ossified. connective tissue molecular composition trait