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Binding of the truncated rgC1qR (TF), lacking amino-terminal residues 74 to 95, to immobilized staphylococcal protein A. Biotinylated rgC1qR (TF) was incubated on protein A-coated microtiter wells for 1 h at 37°C. Binding was detected with AP-STRAV using pNPP substrate. C1q- and BSA-coated microtiter wells served as controls. Values represent means ± SD; n = 6. O.D., optical density.
