Abstract
The proteins were isolated from the healthy portions of carious human molars. Analyses of the amino acid content were performed on 7 different prepns. of the proteins, 5 molars being used for each prepn. The results were averaged, and the amino acid composition of the protein from the healthy portion of the carious dentin was practically identical to that of the protein obtained from normal dentin. The amino acid composition of the enamel protein isolated from the healthy portion of carious teeth showed marked differences from that of the protein isolated from normal enamel.

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