Wilkins

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original papers

398

Š 2003 Nature Publishing Group

NATURE | VOL 421 | 23 JANUARY 2003 | www.nature.com/nature

original papers

NATURE | VOL 421 | 23 JANUARY 2003 | www.nature.com/nature

Š 2003 Nature Publishing Group

399

original papers

400

Š 2003 Nature Publishing Group

NATURE | VOL 421 | 23 JANUARY 2003 | www.nature.com/nature

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