1. Departments of Biomedical Engineering and Chemistry, Boston University, Boston, Massachusetts 02215, Affinergy, Inc., Durham, North Carolina 27713, Department of Microbiology and Immunology, Dartmouth Medical School, Hanover, New Hampshire 03755, Department of Orthopedic Surgery, Children’s Hospital, Harvard Medical School, Boston, Massachusetts 02215, and Department of Pathology, Duke University Medical Center, Durham, North Carolina 27710