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Tryptophan in ~-casein was oxidized with N-bromosuecinimidc (NBS) showing four residues in 56,000 g. Careful oxidation of four tryptophan residues in K-casein resulted in only slight degradation of the molecule and did not change its stabilizing ability to cc~-casein against Ca ~.
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Nakai et al. (1966) studied this question.
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