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Anther of a flowering plant (Arabidopsis thaliana) (20x), 2015 by Estonian scientist Heiti Paves at Tallinn University of Technology using a confocal microscope.
Confocal microscopy produces very small depth of field: the operator combines many wafer-thin section views of a subject to create a three-dimensional image. Paves has been using such technology for thirty years to investigate processes in living cells.