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Schematic representation of the system DA neurons at early larval stages (A), late larval/early pupal stages (B), and the adult (C). Nomenclature of DA neurons is shown in association with the names of the corresponding lineages. Primary neurons are indicated by large circles, secondary neurons by small circles. The innervation of the different compartments of the mushroom body and central complex of the adult brain by clusters PPL1, PPL2, PAM1, and PPM3 is indicated.
