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2. Bodmer, W., Tripp, M. Bodmer, J. See also Transplantion 10 135 (1970)
3. Harris, S., Harris, T.N., Farber, M.: J. Immunol. 72, 148 (1954)
4. Riggs, J.L., Sewiwald, R.J., Burckhalter, J., Downs, C.M., Metcalf, T.J.: Am. J. Pathol. 34, 1081 (1958)