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Umbilical cord was shown to contain chondroitin sulfate B and a small amount of glucosamine-containing sulfated mucopolysaccharide, in addition to hyaluronic acid and chondroitin sulfate C. All of the hyaluronic acid and part of the chondroitin sulfate C could be extracted directly with dilute sodium chloride; the rest of the chondroitin sulfate C and the chondroitin sulfate B were released only after digestion with proteolytic enzymes.
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Danishefsky et al. (1966) studied this question.
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