1. Iron was added to hen ovotransferrin to 30% saturation and the protein was digested with trypsin or chymotrypsin. 2. Iron-binding fragments were isolated. They carried one atom of iron/mol (mol.wt. 35000) and consisted of a single polypeptide chain derived from the N-terminal half of the protein. Carbohydrate was not present. 3. The fragments were able to bind a variety of metals and to donate iron to reticulocytes.

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