A Human retina is seen with the cones in the middle of the image, surrounded by capillaries and nerve cells, seen in black. retina under the microscope microscopic retina photography art photo microscopy artwork
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Bubonic plague bacteria (yellow) on part of the digestive system in a rat flea (purple). Joseph Hinnebusch, Elizabeth Fischer and Austin Athman, National Institute of Allergy and Infectious Diseases, National Institutes of Health.