Brade, V Formation of the C3-cleaving properdin enzyme on zymosan. Demonstration that factor D is replaceable by proteolytic enzymes. [electronic resource] - Journal of immunology (Baltimore, Md. : 1950) Dec 1974 - 1735-43 p. digital Publication Type: Journal Article ISSN: 0022-1767 Subjects--Topical Terms: AnimalsBlood Proteins--metabolismChromatography, DEAE-CelluloseComplement System Proteins--isolation & purificationEdetic Acid--pharmacologyFibrinolysinGuinea PigsPeptide Hydrolases--metabolismProperdin--isolation & purificationTrypsinTrypsin InhibitorsVenomsZymosan--metabolism