Definition: An electrode of very fine caliber consisting usually of a fine wire or a glass tube of capillary diameter (10 mcm–1 mm) drawn to a fine point and filled with saline or a metal such as gallium or indium (while melted); used in physiologic experiments to stimulate or to record action currents of extracellular or intracellular origin.
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Examples: glitazone, GI cocktail, etc.
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