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MODEL RELEASED. Scientist in a hospital pathology laboratory operating a Coulter counter. A computer-controlled Coulter counter counts and measures the sizes of red & white blood cells and platelets in any given sample. It can also estimate the haemoglobin content of red blood cells. Results are presented as histograms on the computer screen or on a print-out. (KEYSTONE/SCIENCE PHOTO LIBRARY/SIMON FRASER, HEXHAM GENERAL HOSPITAL/ SCIENCE PHOTO LIBRARY)