The high- and low-sulphur protein fractions are prepared by the reductive fission of the disulphide bonds in the ortho cortex and the paracortex. The amino acid analyses of the kerateine fractions show that the orthocortex is rich in low- sulphur proteins and contains a small fraction of aromatic proteins, while the paracortex has a larger proportion of the high-sulphur protein. The soluble proteins from these two cortices are not extracted completely by a reductive fission, but they are retained to some extent in the insoluble kerateine residues.
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