This lecture explores the properties and applications of collagen, a protein found in various tissues like skin, bone, and tendons. It covers the different types of collagen, its molecular changes in aging, and its use in biomaterials for tissue engineering. Additionally, it discusses elastin, elastin-like synthetic materials, cellulose, proteoglycans, and saccharides as biomaterials. The lecture also delves into the role of cellulose as a tissue engineering scaffold and the induced osteogenesis in cellulose constructs, showcasing their potential in promoting bone-like tissue growth.