SLC6A3 and Dystonia: Chorea was also a prominent HMD in seven children with neurotransmitter defects (DDC, TH, SLC6A3), commonly in tandem with dystonia (n = 5), ballismus (n = 2), myoclonus (n = 1), coarse tremor (n = 3), and stereotypies (n = 1) (Video S3).