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© 1997 Nature Publishing Group http://www.nature.com/nsmb
© 1997 Nature Publishing Group http://www.nature.com/nsmb
© 1997 Nature Publishing Group http://www.nature.com/nsmb
© 1997 Nature Publishing Group http://www.nature.com/nsmb
© 1997 Nature Publishing Group http://www.nature.com/nsmb