Differential interference/Nomarsky image of `Candidatus Mycoplasma haemolamae' in the peripheral blood of an alpaca. Differences in density on the blood smear preparation are transformed into differences in the height of the image, creating a 3-D effect. Red blood cells are 8 × 4 μm. Picture produced by Thomas E. Eurell and supplied by Joanne Messick, University of Illinois at Urbana-Champaign, IL, USA.

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