Amino sugars are a type of sugar molecule that contains an amino group, which is a functional group made up of nitrogen and hydrogen. These sugars are important components of various biological structures, including glycoproteins and glycolipids, which play crucial roles in cell recognition and signaling. One of the most common amino sugars is glucosamine, which is often found in chitin, a structural component in the exoskeletons of insects and crustaceans. Amino sugars are also involved in the synthesis of hyaluronic acid, a substance that helps maintain skin hydration and joint lubrication.