Biophysics: http://www.fas.harvard.edu/~biophys/
Biological and Biomedical Sciences (BBS): http://www.hms.harvard.edu/dms/bbs/
Program in Neuroscience: http://www.hms.harvard.edu/dms/neuroscience/
System Biology: http://sysbiophd.harvard.edu/
Chemistry or Chemical Physics: https://chemistry.harvard.edu/pages/graduate-program
Chemistry or Chemical Biology: http://chembiophd.harvard.edu/