Sorry, for copyright reasons some images on this page may not be available online © 1978 Nature Publishing Group

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Date: 2017-01-18 08:25:16		Sorry, for copyright reasons some images on this page may not be available online © 1978 Nature Publishing Group Add to Reading List Source URL: dacemirror.sci-hub.tw Download Document from Source Website File Size: 492,10 KB Share Document on Facebook