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Protein Definition
What Is Protein?

Any of numerous complex nitrogen-containing substances that consist of chains of amino acids, are present in all living cells, and are an essential part of the human diet. Proteins are a class of nitrogenous organic compounds composed of one or more chains of amino acids and forming an essential part of all living organisms. Proteins have been described as the stuff of life. Chemically they are distinguished from fats and carbohydrates by containing nitrogen. They are composed of carbon, hydrogen, oxygen, nitrogen, sulphur, and sometimes phosphorus.This suitably describes the very important part proteins have in the structure and function of every living cell in the body. They comprise between 10-30 per cent of cell mass. They have many varied roles, acting as enzymes, hormones, respiratory pigments (haemoglobin is a protein), and antibodies. The two main contractile elements in muscle cells, actin, and myosin, are proteins. The sequence of the amino acids in a protein determines its overall structure and function: many proteins are enzymes; others are structural (e.g. collagen in connective tissue and keratin in hair and nails); many hormones are polypeptides.

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