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From The Collaborative International Dictionary of English v.0.48:
Neurokeratin \Neu`ro*ker"a*tin\, n. [Neuro- + keratin.] (Physiol. Chem.) A substance, resembling keratin, present in nerve tissue, as in the sheath of the axis cylinder of medullated nerve fibers. Like keratin it resists the action of most chemical agents, and by decomposition with sulphuric acid yields leucin and tyrosin. [1913 Webster] Neurologic