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NM-containing neuron and lipofuscin-containing neuron in SN pars compacta of 73-year-old men. The lipofuscin pigment (L) appears fluorescent. Excitation with the yellow (561 nm) laser. Neuromelanin (NM) within a neuron is non-fluorescent. Autofluorescence of nerve tissue upon excitation with 405 nm laser. Laser scanning microscopy. Scale bar: 20 μm.
