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Twin sisters, monozygotic with the fragile X mutation, but with a different phenotype
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    A case for agreed nomenclature?

    Dear Editor

    I would like to draw to the attention of your readers that the pair of twins described in this report[1] are the same twins that we described in our paper Tuckerman et al.[2] I feel that failing to directly quote our paper was rather an oversight by Willemsen et al. on a number of counts.

    First, our paper contains a more detailed family history and description of the twins...

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    Conflict of Interest:
    None declared.