Lymphedema (lymphoedema in British English), also known as lymphatic obstruction, is a condition of localized fluid retention and tissue swelling caused by a compromised lymphatic system, which normally returns interstitial fluid to the thoracic duct and then the bloodstream.ymphedema (lymphoedema in British English), also known as lymphatic obstruction, is a condition of localized fluid retention and tissue swelling caused by a compromised lymphatic system, which normally returns interstitial fluid to the thoracic duct and then the bloodstream.
1 A polypeptide is a single linear chain of many amino acids, held together by amide bonds. 2  A protein is one or more polypeptide (more than about 50 amino acids long).  An oligopeptide consists of only a few amino acids (between two and twenty).
Tertiary structure. The three-dimensional structure of a protein. A polypeptide is a molecule made from a large number of amino acids joined by condensation. This polypeptide is folded to form a protein. Some sections of the polypeptide coil and fold to produce the secondary structure of the protein. The whole protein then folds into a specific three-dimensional shape known as the tertiary structure.