1 Laboratory of Nuclear Dynamics and Architecture, Institute of Medical Biology, Agency for Science, Technology and Research (A(∗)STAR), 8A Biomedical Grove, Immunos, Singapore 138648. Electronic address: wei.xie@imb.a-star.edu.sg.
2 Laboratory of Nuclear Dynamics and Architecture, Institute of Medical Biology, Agency for Science, Technology and Research (A(∗)STAR), 8A Biomedical Grove, Immunos, Singapore 138648.