MOE Key Laboratory of Bioinformatics, Tsinghua University, Beijing, China.|State Key Laboratory of Bio-membrane and Membrane Biotechnology, Tsinghua University, Beijing, China.|State Key Laboratory of Bio-membrane and Membrane Biotechnology, Tsinghua University, Beijing, China.|State Key Laboratory of Bio-membrane and Membrane Biotechnology, Tsinghua University, Beijing, China.|MOE Key Laboratory of Bioinformatics, Tsinghua University, Beijing, China.