© 1993 nature publishing group...
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© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics
© 1993 Nature Publishing Group http://www.nature.com/naturegenetics