Involved in microtubule stabilization in many cell types, including neuronal cells. Specifically has microtubule cold stabilizing activity. Involved in dendrite morphogenesis and maintenance by regulating lysosomal trafficking (By similarity). In the embryo is expressed in the developing hindbrain and is accumulated in rhombomere boundary regions and in the rhombomere 2, 4 and 6. Belongs to the STOP family.