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Action of Different Proteolytic Enzymes on the Surface of Nucleated Red Cells

The action of several proteolytic enzymes on the surface of nucleated red cells (chicken) was investigated by isoelectric focusing of the released mucopeptides. It was found, that each protease splits off a characteristic mucopeptide pattern. In addition to these glycoproteinderived substances, a phosphorus-containing fraction was also liberated. Similar observations were made with duck erythrocytes.