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CL responses after stimulation with the capsulated Klebsiella strains K21a after opsonization with NHS (A), C1q-depleted serum (B), EGTA-treated serum (C), factor-B-depleted serum (D), EGTA-treated factor-B-depleted serum (E) and heat-inactivated serum (F). * p < 0.001, C vs. A and B; ** p < 0.001, vs. A and B; *** p < 0.001, vs. D; **** p < 0.0001, vs. other groups.
