Involved in the regulation of the microtubule (MT) filament system by destabilizing microtubules. It prevents assembly and promotes disassembly of microtubules (By similarity). Binds to two alpha/beta-tubulin heterodimers. Many different phosphorylated forms are observed depending on specific combinations among the sites which can be phosphorylated. MAPK is responsible for the phosphorylation of stathmin in response to NGF (By similarity). Belongs to the stathmin family.