The biological activity of angiotensin agonists has been determined in a highly sensitive in vitro assay system, based upon aldosterone production by isolated dog adrenal cells. The responses to angiotensin II and the heptapeptide [Des-Asp-1]-angiotensin II are identical, while the [Des-Asp-1, Des-Arg-2]-hexapeptide and the [Des-Phe-8]-heptapeptide are… (More)