Coloured scanning electron micrograph (SEM) of rods (yellow) and cones (green) in the retina of the eye. The outer nuclear layer is purple. Magnification when printed at 10 centimetres wide. RF Image No.
Capillary network in skeletal or striated muscle. The many loops allow the capillaries to change their length in response to changes in the length of muscle fibers during contraction relaxation and weight change.
Coloured SEM of Shigella dysenteriae bacteria, the cause of dysentery in humans. Until the introduction of sulphonamide drugs in the it was a worldwide killer disease. It still affects the young, elderly, and malnourished.