Movement disorder phenotypes in the CLN2 patient cohort, extracted from the video examinations: ataxia evidenced by a broad-based gait and tendency to fall, with added left foot dystonic posturing; brief generalized myoclonus at rest; marked bilateral upper limb action tremor on reaching out; generalized chorea while seated in a car seat; hyperreflexia with spreading and sustained ankle clonus; bilateral dystonic great toe posturing; and generalized hypokinesia.Download Supplementary Video 1 via http://dx.doi.org/10.1212/209615_Video_1. The gene discussed is TPP1; the disease is cerebellar ataxia.