Collagen

Collagen is a protein that aids the joining of tissues.

According to the scientific report, published in the online journal Biofabrication, the printed skin has all the essential parts of the natural skin, such as the dermis (the layer of tissue that contains capillaries, nerve endings and other structures), the epidermis (the layer of cells atop the dermis), the stratum corneum (the horny outer layer), and even the collagen, which gives skin its elasticity and mechanical strength.

To address wrinkling below eye level, plastic surgeons turn to fillers, including tiny plastic beads, liquid silicone, and collagen from cows and even humans to plump up the grooves in one's skin.

Science cannot yet account for the conversion of collagen into gelatin.