Affiliation: | From the ‡Vascular Program, Institute for Cell Engineering.;the §McKusick-Nathans Institute of Genetic Medicine.;the ¶Predoctoral Training Program in Human Genetics.;the ‖Department of Biomedical Engineering, and ;the **Departments of Medicine, Oncology, Pediatrics, Radiation Oncology, and Biological Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205 |