||Hall, D. A. (ed) (1964) International Review of Connective Tissue Research, Vol. 2, F. Verzár, Aging of the Collagen Fiber, Academic Press, New York, p. 244 top paragraph
||P. 244 top paragraph: "Connective tissue takes part in the structure of most organs. Its main protein is collagen, which may thus be 30-40% of all the proteins of the body. Collagen is a macromolecule deposited in the form of fibers. It occurs as almost chemically pure collagen in the tendons, as a convolute of fibers in a ground substance in the corium [dermis] of the skin, as the substance of bones on which calcium is deposited, or as the interstitial fibrous tissue between muscle fibers, in fascia and membranes of articulations, etc."