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Patent Pending Atrial natriuretic peptide (ANP), atrial natriuretic factor (ANF), atrial natriuretic hormone (ANH), Cardionatrine, Cardiodilatine (CDD) or atriopeptin, is a powerful vasodilator, and a protein (polypeptide) hormone secreted by heart muscle cells.[1][2][3] It is involved in the homeostatic control of body water, sodium, potassium and fat (adipose tissue).