Key Laboratory of Systems Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China. Tel.: +86 21-5492-0100, Fax: +86 21-5497-2551, lnchen@sibs.ac.cn.|Key Laboratory of Systems Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China. Tel.: +86 21-5492-0100, Fax: +86 21-5497-2551, lnchen@sibs.ac.cn.|Key Laboratory of Systems Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China. Tel.: +86 21-5492-0100, Fax: +86 21-5497-2551, lnchen@sibs.ac.cn.|Key Laboratory of Systems Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China. Tel.: +86 21-5492-0100, Fax: +86 21-5497-2551, lnchen@sibs.ac.cn.|Key Laboratory of Systems Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China. Tel.: +86 21-5492-0100, Fax: +86 21-5497-2551, lnchen@sibs.ac.cn.