1. Medical Research Center, Brookhaven National Laboratory, Upton, New York.
2. Medical Department A, University of Copenhagen School af Medicine, Copenhagen, Denmark.
3. Division of Experimental Pathology, Medical Research Center, Brookhaven National Laboratory, Upton, N. Y.
4. Freiburg/Breisgau, Germany.
5. Medical Research Center, Brookhaven National Laboratory, Upton, N. Y.