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Matrix-assisted laser desorption ionization-mass spectrometry (MALDI-MS) imaging of brain tissue sections after 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) administration. The relative ion density of PEP-19 from one control (a) and one MPTP-treated animal (b) shows that there is a reduction of PEP-19 expression in the striatum. Adapted from Skold et al (2006).
