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Photomicrographs showing distribution of dark neurons (DNs) in Substintia Nigra pars compacta (SNc) subdivisions of Balb/c mice in the Sham-control (a), 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) (b), L-Arginie-control (c), and L-arginine plus MPTP (d) groups. DNs pointed with black arrows. As shown the distribution of DNs in SNc sub-region were strikingly increased in MPTP and L-arginine plus MPTP group animals, compared to Sham-control and L-arginine-control Balb/c Mice
