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©20
07 N
atur
e Pu
blis
hing
Gro
up h
ttp://
ww
w.n
atur
e.co
m/n
atur
egen
etic
s
©20
07 N
atur
e Pu
blis
hing
Gro
up h
ttp://
ww
w.n
atur
e.co
m/n
atur
egen
etic
s
©20
07 N
atur
e Pu
blis
hing
Gro
up h
ttp://
ww
w.n
atur
e.co
m/n
atur
egen
etic
s
©20
07 N
atur
e Pu
blis
hing
Gro
up h
ttp://
ww
w.n
atur
e.co
m/n
atur
egen
etic
s
©20
07 N
atur
e Pu
blis
hing
Gro
up h
ttp://
ww
w.n
atur
e.co
m/n
atur
egen
etic
s