Abstract
Summary
Vasoconstriction of the isolated vessels of the rabbit's ear follows the addition of fresh plasma to perfusates containing liver preparations that are in themselves inactive. The activation caused by plasma is indistinguishable from the effect of subthreshold amounts of epinephrine added to these tissue fractions. Incubation of plasma, known to result in loss of its epinephrine content, also causes loss of its vasoconstrictive influence on perfusate containing liver fractions.
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