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The online version of the original article can be found at 10.1038/004040a0
The online version of the original article can be found at 10.1038/004045b0
The online version of the original article can be found at 10.1038/004047a0
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Erratum. Nature 4, 80 (1871). https://doi.org/10.1038/004086c0
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DOI: https://doi.org/10.1038/004086c0
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