Institution: | From the Departments of ‡Biological Chemistry, ;§Veterinary Resources, and ;¶Biological Services, Weizmann Institute of Science, Rehovot 76100, Israel, ;the ‖Timrat and Sackler School of Medicine, Tel Aviv University, Ramat Aviv 69978, Israel, and ;the **School of Biology and Petit Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, Georgia 30332-0230 |