JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Light micrograph showing Purkinje fibres, part of the conducting system of the heart. They appear as large muscle fibres with few myofibrils. They are located in the subendocardium, just beneath the endocardium. Magnification: x90 when printed at 10 centimetres wide.
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