Bioinformatics Research Centre, School of Computer Engineering, Nanyang Technological University, Singapore. yang0293@e.ntu.edu.sg|Bioinformatics Research Centre, School of Computer Engineering, Nanyang Technological University, Singapore. yang0293@e.ntu.edu.sg|Bioinformatics Research Centre, School of Computer Engineering, Nanyang Technological University, Singapore. yang0293@e.ntu.edu.sg|Bioinformatics Research Centre, School of Computer Engineering, Nanyang Technological University, Singapore. yang0293@e.ntu.edu.sg|Bioinformatics Research Centre, School of Computer Engineering, Nanyang Technological University, Singapore. yang0293@e.ntu.edu.sg