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A fragile site at 19p13 was found in the mother of a newborn girl with Downs syndrome. The fragile site was expressed in medium containing low folate and by addition of FdU, whereas high folate, thymidine and thymidine-analogues inhibited the expression. This fragile site may prove valuable for linkage studies on chromosome 19.
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Tommerup et al. (1985) studied this question.
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