Two types of hypertensin have been demonstrated by means of counter-current distribution. The first type is the product of the action of the enzyme, renin, upon its substrate and has been designated hypertensin I. It can be rapidly converted to a second approximately equally pressor compound, hypertensin II, apparently through the action of an enzyme in the plasma which requires halide or nitrate for activation.
A highly purified preparation containing horse hypertensins I and II caused an elevation of blood pressure when injected into human beings.
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Copyright, 1954, by The Rockefeller Institute for Medical Research New York
1954
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