Yup. Good friend of mine in high school had (has?) a foster brother who had it. Don't know too much about it, but recall that one of the characteristics is involuntary "ticks." Jimmy's tick was in his mouth that he sort of "stretched" often, as well as a shoulder and head twitch. He was pretty developmentally delayed (about 4th grade level at age 18), but a very personable and well behaved young man.
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