5
© 1996 Nature Publishing Group

N a t u r e P u b l i s h i n g G r o u p · sc kar3 cg ch02 dm ncd hs khc eg5 mm kif1b sc kar3 cg ch02 ncd kvm rfrplnesevnrgdky----- qvvvrcrpfnqlerkassh----- kva rvrpfnsretskesk--

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Page 1: N a t u r e P u b l i s h i n g G r o u p · sc kar3 cg ch02 dm ncd hs khc eg5 mm kif1b sc kar3 cg ch02 ncd kvm rfrplnesevnrgdky----- qvvvrcrpfnqlerkassh----- kva rvrpfnsretskesk--

© 1996 Nature Publishing Group

Page 2: N a t u r e P u b l i s h i n g G r o u p · sc kar3 cg ch02 dm ncd hs khc eg5 mm kif1b sc kar3 cg ch02 ncd kvm rfrplnesevnrgdky----- qvvvrcrpfnqlerkassh----- kva rvrpfnsretskesk--

© 1996 Nature Publishing Group

Page 3: N a t u r e P u b l i s h i n g G r o u p · sc kar3 cg ch02 dm ncd hs khc eg5 mm kif1b sc kar3 cg ch02 ncd kvm rfrplnesevnrgdky----- qvvvrcrpfnqlerkassh----- kva rvrpfnsretskesk--

© 1996 Nature Publishing Group

Page 4: N a t u r e P u b l i s h i n g G r o u p · sc kar3 cg ch02 dm ncd hs khc eg5 mm kif1b sc kar3 cg ch02 ncd kvm rfrplnesevnrgdky----- qvvvrcrpfnqlerkassh----- kva rvrpfnsretskesk--

© 1996 Nature Publishing Group

Page 5: N a t u r e P u b l i s h i n g G r o u p · sc kar3 cg ch02 dm ncd hs khc eg5 mm kif1b sc kar3 cg ch02 ncd kvm rfrplnesevnrgdky----- qvvvrcrpfnqlerkassh----- kva rvrpfnsretskesk--

© 1996 Nature Publishing Group