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Most studies of adult neurogenesis are concerned with neuronal age. This is because new neurons develop from a stage where they have no excitatory synapses to one where they have many.

The acclaimed working hypothesis that different subpopulations of newborn, differentiating neurons could be playing different roles arouses great interest.This review summarizes the current research carried out using these techniques and outlines some of the key applications.The accurate labeling of newborn cells in the adult brain poses a fundamental challenge in the study of adult neurogenesis.It is therefore critical that the developmental timecourse of new neurons be mapped out, so we know when new neurons become functionally relevant, or whether they might even have different functions at different ages.Below are what I hope to be comprehensive visual collages of all published timecourse experiments, where a certain property of new neurons is examined at multiple (≥ 3) different ages.

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