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XB-ART-30014
Nature 1983 Nov 03;3065938:36-40.
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Optical recording of action potentials from vertebrate nerve terminals using potentiometric probes provides evidence for sodium and calcium components.

Salzberg BM , Obaid AL , Senseman DM , Gainer H .


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Optical methods are shown to monitor action potentials from a population of nerve terminals in the neurohypophysis of Xenopus. Calcium antagonists such as cadmium and nickel ions block a component of the action potential that probably reflects a calcium-mediated potassium conductance, and tetrodotoxin blocks an inward sodium current, revealing a calcium component to the action potential upstroke.

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