Shanghai Center for Bioinformation Technology, Shanghai, PR China. yuhui@scbit.org <yuhui@scbit.org>|Shanghai Center for Bioinformation Technology, Shanghai, PR China. yuhui@scbit.org <yuhui@scbit.org>|Shanghai Center for Bioinformation Technology, Shanghai, PR China. yuhui@scbit.org <yuhui@scbit.org>|Shanghai Center for Bioinformation Technology, Shanghai, PR China. yuhui@scbit.org <yuhui@scbit.org>|Shanghai Center for Bioinformation Technology, Shanghai, PR China. yuhui@scbit.org <yuhui@scbit.org>|Shanghai Center for Bioinformation Technology, Shanghai, PR China. yuhui@scbit.org <yuhui@scbit.org>