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Buffer (A and C) or M1 protein (1 µg/ml) (B and D) was incubated with whole blood (diluted 1∶10) from a responder (A and B) and a non-responder (C and D). Red blood cells were lysed and the samples were subjected to scanning electron microscopy. Arrows indicate neutrophils/monocytes. Scale bar: 20 µm.
