Abstract
1. 1. The soluble organic matrices of both fetal and adult bovine enamel were found to contain relatively large amounts of protein-bound organic phosphorus. 2. 2. Several peptide fractions were separated from partial acid hydrolysates of the proteins which contained both organid phosphorus and relatively large amounts of serine. 3. 3. Further acid hydrolysis of the phosphopeptides separated by chromatography on Dowex50, H +, X2 resin, or more complete acid hydrolysis of the original proteins yielded a fraction which moved identically with serine phosphate on paper electrophoresis. After complete hydrolysis of this fraction, the only amino acid recovered was serine. 4. 4. A possible role was proposed for the protein-bound serine phosphate in initiating the nucleation of the inorganic crystals of enamel.
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