NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY NATIONAL PHYSICAL LABORATORY (C) CROWN COPYRIGHT / SCIENCE PHOTO LIBRARY
Haemoglobin blood test. Researcher using optical equipment to test for the presence of haemoglobin in a blood sample. Haemoglobin is the oxygen-carrying pigment that gives blood its red colour. Photographed in the Light Division of the National Physical Laboratory, Teddington, UK.
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