AJ PHOTO / SCIENCE PHOTO LIBRARY AJ PHOTO / SCIENCE PHOTO LIBRARY
Cell research. A researcher pipetting a sample from a solution of cells on to a malassez slide. A malassez slide holds a known volume of liquid and has a grid etched into its centre. When placed under a microscope the number of cells per square can be counted and averaged. The number of cells in any volume of the solution can then be calculated. Photographed at Genethon Laboratory, near Paris, France.
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