Coloured scanning electron micrograph (SEM) of Proteus mirabilis, Gram-negative, enteric, anaerobic, rod prokaryote. When introduced to the urinary tract, this uncomplicated enteric microorganism splits urea which raises pH and causes stone formation. Blockage can lead to kidney disease, urinary tract infection, or sepsis (blood disease). Magnification: x2,400 when shortest axis printed at 25 millimetres.
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