Explore this important protein in the image gallery below
Collagen is a fibrous protein that provides structural support to tissues. In our bodies, it is found in connective tissues in bone, teeth, tendons, ligaments, cartilage, artery walls and elsewhere. Collagen accounts for around one-third of all protein in vertebrates.
Image research by Iona Twaddell and captions by Rosie Cotter, adapted from Wellcome Collection unless stated otherwise.