Word: ibring
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...chromosomes isolated from white blood cells. The defective site is often clearly visible at the end of one of the chromosome's arms. Last year a more accurate diagnostic test was devised by Geneticist W. Ted Brown, of the New York State Institute for Basic Research in Developmental Disabilities (IBR) on Staten Island. Brown's team uses a technique in which snippets of DNA taken from the X chromosomes of people suspected of having the condition are compared with snippets from their normal relatives...
...understands exactly how or why the Fragile X mutation affects the brain. Autopsy studies by IBR Director Henry Wisniewski and his colleagues have shown that the number of connections, or synapses, between brain cells in autistic children with Fragile X syndrome is unusually low and the connections that do exist are not well developed. "In normal adults the connections are short and stubby," says Brown. "In Fragile X, they are longer and thinner, as in newborns. It's as if a stage of development hadn't been achieved. They haven't made the normal contacts between cells...