A protein molecule is made from a long chain of these amino acids, each linked to its neighbor through a covalent peptide bond. Proteins are therefore also known as polypeptides. Each type of protein has a unique sequence of amino acids, exactly the same from one molecule to the next.

In the present book, nine typical literatures about Protein Chemistry published on international authoritative journals were selected to introduce the worldwide newest progress, which contains reviews or original researches on Protein Chemistry. We hope this book can demonstrate advances in Protein Chemistry as well as give references to the researchers, students and other related people.