基金This work was supported by the Grants from Chinese Ministry of Agriculture (No. 948-2001-101), Chinese Ministry of Science and Technology (No. 2003AA207010), Shanghai Municipal Science and Technology Commission (No. 02ZC14082), and the Rocke-feller Foundation.
基金This work was supported by Chinese National Programs for High Technology Research and Development (863 Project) (No. 2003AA207010), Chinese Ministry of Agriculture (948 Project) (No. 2001-101) and Shanghai Municipal Science and Technology Commission (No. 03DJ14014, 02ZC14082).