Influence of Epinephrine on Vasoconstrictor Action of Kidney Extracts.

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Abstract
Protein fractions of hog kidney, in themselves inactive on perfusion, become strongly vasoconstrictive when supplemented with traces of epinephrine. While a similar influence of minute quantities of epinephrine on vasoconstriction occurs with some sym-pathomimetic amines, insufficient information is at hand to clarify the pharmacologic nature of the observed synergistic action.