TY  - JOUR
AU  - Li, Shelly
TI  - Replacement
JA  - Nature
PY  - 2009/01/22/print
VL  - 457
IS  - 7228
SP  - 504
EP  - 504
PB  - Nature Publishing Group
SN  - 0028-0836
UR  - http://dx.doi.org/10.1038/457504a
M3  - 10.1038/457504a
N1  - 10.1038/457504a
ER  -