Amazing images reveal microscopic worlds

Kangaroo Rat Kidneys - Keratin filaments in the cytoplasm and nucleus of rat kidney cells help the cells maintain their shape in this Nikon Small World image by Harvard's Lynne Chang. The annual photograph competition highlights microscopic images, and winners will be announced in October. (LiveScience/Dr. Lynne Chang, Harvard Medical School, Boston, MA)

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Rat kangaroo kidneys, cow cells and mouse ears are among the worlds that photographers are peering inside for Nikon Instruments' annual Small World photography competition.

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