Molecular determinants of GABAergic local-circuit neurons in the visual cortex.

Golgi impregnation, intracellular marking techniques and immunocytochemistry have led to the identification of several distinct GABAergic cell types. Co-localization of neuropeptides or calcium-binding proteins has provided additional markers for GABAergic cells. Recently, immunological or lectin probes have helped to identify additional subsets of GABAergic neurons. In combination with other immunocytochemical and anatomical approaches, these probes are now being used to link molecular composition to cellular architecture in the visual cortex.