A euglobulin fraction of human C'1 has been chromatographically resolved into three distinct activities, designated C'1q, C'1r, and C'1s, in the order of their elution from DEAE cellulose. All three… (More)
A detailed method for the zymosan assay of properdin is described, together with procedures for the preparation and standardization of reagents employed in the test. The reliability and… (More)
In an attempt to explain the natural resistance •¿ of animals to heterologously transplanted tumors, it was theorized that the protective mechanism may be due to the properdin system (1,3). To test… (More)