The proteins are biological macromolecules that are of primary importance to all living organisms. These macromolecules do the major work in building and controlling cells and tissues. There are more than 30,000 different kinds of protein in our bodies. For example, hemoglobin which carries oxygen to our tissues, insulin that regulates sugar level in the blood, the antibodies that fight infection, the actin and myosin that allows our muscles to contract, and keratin in skin, hair and finger nails are all proteins.
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