Journal of Experimental Medicine122(2),277–298(1965); DOI10.1084/jem.122.2.277; original full text pmc.ncbi.nlm.nih.gov/articles/PMC2138056/ . Primary Abstract verified in LEVEL015 Goodall preparation: isolated beta1F-globulin, kinetic ordering after C3 and dependence of hemolytic function on C6. Current direct PMC fetch is challenged. Initial-only U.R.Nilsson retained.