In addition a number of DNA markers have also been identified on the short arm of chromosome four that are closely bound to the mutated gene . These are D4S10 , D4S43 and D4S953 . The identification of these markers has made it possible for prenatal screening to be done and also to screen patients who have a family history or ones that may be asymptomatic for further evaluation and management . Positron emission tomography may also be useful as a diagnostic tool as...











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