STMN2 and Down syndrome: Stmn2 functions in microtubule stability and neuronal growth, and given that decreased Stmn2 expression has been implicated in injury‐induced axonal degeneration 36, Down's syndrome 37, and AD 38, the striking repression of Stmn2 in HD cells suggests a common Stmn2 dysfunction in a certain number of neurodegenerative diseases.