1. Department of Anatomy, Western Reserve University, Cleveland, Ohio, The work was done during the tenure of an Established Investigatorship of the American Heart Association
2. Department of Chemistry and Chemical Engineering, Case Institute of Technology, Cleveland, Ohio
3. Department of Biophysics, Naval Medical Research Institute, National Naval Medical Center, Bethesda, Maryland. Present address, Department of Biophysics, Yale University, New Haven, Conn
4. Department of Physiology, Naval Medical Research Institute, National Naval Medical Center. Present address, Department of Anatomy, Georgetown University, Washington, D. C.
5. Department of Biophysics, Naval Medical Research Institute, National Naval Medical Center, Bethesda, Maryland