Regulator of microtubule stability. When phosphorylated by MAPK8, stabilizes microtubules and consequently controls neurite length in cortical neurons. In the developing brain, negatively regulates the rate of exit from multipolar stage and retards radial migration from the ventricular zone (By similarity). Interacts with MAPK8 (By similarity). Interacts with ITM2C. Interacts with KIFBP. Interacts (via the N-terminal region) with CIB1 (via C-terminal region); the interaction is direct, occurs in a calcium-dependent manner and attenuates the neurite outgrowth inhibition of STMN2. Associated with punctate structures in the perinuclear cytoplasm, axons, and growth cones of developing neurons. SCG10 exists in both soluble and membrane-bound forms. Colocalized with CIB1 in neurites of developing hippocampal primary neurons (By similarity). Colocalized with CIB1 in the cell body, neuritis and growth cones of neurons. Colocalized with CIB1 to the leading edge of lamellipodia. Neuron specific. Sumoylated. Phosphorylated mostly by MAPK8, but also by MAPK9 and MAPK10 in the developing brain cortex. N-terminal palmitoylation promotes specific anchoring to the cytosolic leaflet of Golgi membranes and subsequent vesicular trafficking along dendrites and axons. Neuronal Stathmins are substrates for palmitoyltransferases ZDHHC3, ZDHHC7 and ZDHHC15. Belongs to the stathmin family.