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a: Transverse section, overview of the brain, position of the different neuronal cell somata (S1–S3). b: The nuclei of type 1 neurons stain purple. The perikarya are not enlarged. c: Somata of type 2 neurons exhibit orange-stained nuclei. The perikarya are enlarged. d: Cell bodies of type 3 neurons are very prominent; the nuclei stain orange. on outer neurilemma.
