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Nissl substance

(nĭsl)
n.
  1. Material consisting of granular endoplasmic reticulum and ribosomes and occurring in nerve cell bodies and dendrites.Nissl body Nissl granule
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.