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Schematic diagram of the hippocampus showing a mature granule neuron of the dentate gyrus and mature pyramidal neurons of areas CA3 and CA1 as well as their main axonal connections. For each of these cell types, the size and complexity of the dendritic trees as well as the size, shape, and number of dendritic spines can change. In the dentate gyrus, substantial numbers of new neurons (red) are also produced in adulthood.
