Further analyses about collagen present in ductal infiltrating carcinoma of human mammary gland indicate that a large amount of it is represented by type I omotrimer that has been separated from the two other present species, type I eterotrimer and type III, by means of fractionated saline precipitation. Quantitative determinations of the three types, extracted by mild pepsin digestion, are also reported.
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Minafra et al. (1985) studied this question.
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