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DNA-synthesis stimulatory activity was found in some tryptic fragments of human β-casein by using BALB/c3T3 cells, and two of them were identified as the β-casein fragments of Arg[l] to Lys[18] (β-CN(f1-18)) and of Gln[105] to Lys[117] (β-CN(f105-117)).
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Azuma et al. (1989) studied this question.
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