MAP1B (microtubule-associated protein 1B) is a neuronal cytoskeletal protein that regulates microtubule dynamics and stabilization during neuronal development. The protein facilitates proper microtubule organization by binding to at least two tubulin subunits in the polymer, potentially nucleating microtubule polymerization and stabilizing microtubules 1. Phosphorylated MAP1B is essential for appropriate microtubule dynamics and plays a critical role in cytoskeletal changes that accompany neuronal differentiation and neurite extension. MAP1B localizes to various neuronal compartments including dendrites, axons, and synapses, where it contributes to neuron projection development and dendrite formation. The protein also participates in axonogenesis and regulation of microtubule depolymerization. Recent single-molecule imaging studies have revealed that MAP1B mRNA undergoes directional transport toward the cell periphery, suggesting spatially regulated protein synthesis 2. Clinically, MAP1B mutations are associated with autosomal dominant deafness (DFNA83) and periventricular nodular heterotopia, highlighting its importance in proper neural development 1. The protein has also been identified as part of prognostic models in bladder cancer, though its specific role in oncogenesis remains unclear 3.