Abstract
In the connective tissues of the dermis and subcutis of the eel skin, the histochemistry of urea-unmasked glycosaminoglycans has been studied by means of combined staining and enzyme digestion procedures. The staining procedures employed were alcian blue (AB) pH 1.0, AB pH 2.5, aldehyde fuchsin (AF), periodic acid-Schiff (PAS), AB pH 2.5-PAS, high iron diamine (HID) and low iron diamine (LID) methods, whereas the enzymes used were Streptomyces and testicular hyaluronidases, chondroitinases ABC and AC and keratanase. The results obtained have shown that a substantial amount of dermatan sulfate and a relatively small amount of hyaluronic acid, chondroitin, chondroitin sulfate A and/or C were the glycosaminoglycans involved in the connective tissues of the eel skin and that the tissues were devoid of keratan sulfate.
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