The expression of NeuN protein was examined immunocytochemically in the neurons of human substantia nigra (n=14, age: 27-78 years). Some of substantia nigra neurons demonstrated weak NeuN immunopositive reaction, while the others were NeuN-immunonegative. In general, NeuN immunocytochemical reaction in neurons of human substantia nigra was expressed much weaker than in the nucleus rubrum neurons located in the same sections.

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