Actin cytoskeleton-organizing protein that plays a role in the formation of cell projections (By similarity). Plays a role in dendritic spine morphogenesis and organization, including the localization of the dopamine receptor DRD1 to the dendritic spines (By similarity). Involved in synaptic plasticity (By similarity). Brain neurons. Drebrins are classified into two forms of the embryonic type (E1 and E2) and one form of the adult type (A). The time course of their appearance are different from each other. Their structures are closely related.