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Pronunciation: tranz-dū′sin
Definition: A protein that binds guanine nucleotides (a G protein), found in retinal rods and cones, that plays a major role in signal transduction; in vertebrate rod cells it acts as a link of the photolysis of rhodopsin to the activation of cGMP phosphodiesterase.
Examples: glitazone, GI cocktail, etc.
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