Pro"ta*gon\, n. [Proto- + Gr. ? a contest. See. Protagonist. So called because it was the first definitely ascertained principle of the brain.] (Physiol. Chem.) A nitrogenous phosphorized principle found in brain tissue. By decomposition it yields neurine, fatty acids, and other bodies.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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