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Rhesus monkeys offer a strong comparative model for the effects of aging on the human brain, and The Journal of Comparative Neurology is grateful to have the opportunity to feature a unique resource from one of the world's leading authorities on the synaptic and cellular basis of age-related cognitive decline. The 130 high resolution electron micrographs from aging rhesus monkey (Macaca mulatta), provided by Alan Peters and his colleague, Claire Folger, represent 20 years of detailed study, and are a valuable instrument to help gain better insight into the effects of normal aging on the neurons and neuroglial cells in the cerebral hemispheres and associated fiber tracts of the forebrain.