1. Following the convention of Sanger and Tuppy (ref . 2), when the sequence of amino-acids in a peptide is not known, they are enclosed in parentheses and separated by commas.
2. Sanger, F., and Tuppy, H., Biochem. J., 49, 463 (1951).
3. Abelson, P. H., Science, 115, 479 (1952).
4. Perlmann, G. E., in “Phosphorus Metabolism”, 2, 167 (Johns Hopkins Press, 1952).
5. Sanger, F., and Thompson, E. O. P., Biochem. J., 53, 353 (1953).