© 1988 Nature Publishing Group http://www.nature.com/naturebiotechnology
© 1988 Nature Publishing Group http://www.nature.com/naturebiotechnology
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© 1988 Nature Publishing Group http://www.nature.com/naturebiotechnology
© 1988 Nature Publishing Group http://www.nature.com/naturebiotechnology
© 1988 Nature Publishing Group http://www.nature.com/naturebiotechnology
© 1988 Nature Publishing Group http://www.nature.com/naturebiotechnology