Affiliation: | aProgram in Biological and Biomedical Sciences, Harvard Medical School, Children's Hospital, Boston, MA 02115, USA;bLaboratory for Surgical Research, Children's Hospital, Boston, MA 02115, USA;cMax Planck Institut fur physiologische und klinische Forschung, W-6350 Bad Nauhein, Germany;dDepartment of Pathology, Harvard Medical School, Boston, MA 02115, USA |