Abstract
Use of histochemical techniques for the detection of carbohydrates showed variable quantities of glycoproteins in deposits of amyloid, fibrinoid, and hyaline in vessel walls. Staining with alcian blue demonstrated acid mucopolysaccharides in vascular deposits of amyloid. After proteolysis acid mucopolysaccharides were also found in vascular hyaline. Fibrinoid, however, did not tend to bind alcian blue.