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1. The effects of cyanogen bromide on horse-heart cytochrome c and horse-heart myoglobin have been investigated. Cytochrome c yielded four fragments, of which two were haemopeptides. The two colourless peptides had amino acid compositions corresponding to those that are expected, on the basis of the sequence proposed for horse-heart cytochrome c by Margoliash, Smith, Kreil &amp; Tuppy (1961), from cleavage at both methionine residues. Of the two haemopeptides, one was isolated and shown to be that derived from cleavage at only one methionine residue, that nearer to the C-terminus of the peptide chain. 2. Myoglobin also gave four peptides, three of which accounted for the total amino acid content of the intact protein. The fourth fragment arose by cleavage at a single methionine residue, that nearer the C-terminus. Characterization of this fourth fragment made it possible to deduce the order of arrangement of the fragments in the intact molecule.

The action of cyanogen bromide on horse-heart cytochrome c and horse-heart myoglobin