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From The Collaborative International Dictionary of English v.0.48:
Neurine \Neu"rine\ (? or ?), n. [Gr. ney^ron a nerve.] (Physiol. Chem.) A poisonous organic base (a ptomaine) formed in the decomposition of protagon with boiling baryta water, and in the putrefaction of proteid matter. It was for a long time considered identical with choline, a crystalline body originally obtained from bile. Chemically, however, choline is oxyethyl-trimethyl-ammonium hydroxide, while neurine is vinyl-trimethyl-ammonium hydroxide. [Written also neurin.] [1913 Webster]