1. Aronsson, T., and Gronwall, A. (1957).Scand. J. Clin. Lab. Invest., 9, 338.
2. Chargaff, E. (1945).J. Biol. Chem., 161, 389.
3. Kunkel, H. G. and Slator, R. J. (1952).Proc. Soc. Exp. Biol. Med., 80 42.
4. Lancet (Leading Article) (1959).Lancet, ii, 1178.
5. O’Meara, R. A. Q. (1958).Irish J. Med. Sci., vi, 394, 474.