protein

a large group of organic compounds containing carbon, hydrogen, oxygen, sulphur and nitrogen, with individual molecules built up of AMINO ACIDS in long POLYPEPTIDE chains. Globular protein includes ENZYMES , ANTIBODIES , carrier proteins (e.g. HAEMOGLOBIN ) some HORMONES , etc. Fibrous proteins have elasticity and strength and are found in MUSCLE , CONNECTIVE TISSUE and also CHROMOSOMES . Proteins are thus vital to the body and are synthesized from their constituent amino acids, which are obtained from DIGESTION of dietary protein.