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Fig. 1. (A) Natural antibody levels and (B) complement-mediated lysis in five
species of shorebirds, estimated from the log2-transformation of
the score of the 1:2 serial dilution of the shorebirds' sera. Natural antibody
levels were calculated at the step where agglutination stops and complement at
the step at which lysis stops (see text for details). Values are means
± s.e.m.