JOSE CALVO / SCIENCE PHOTO LIBRARY JOSE CALVO / SCIENCE PHOTO LIBRARY
Light micrograph of cross-sectioned striated muscle fibres of the heart atrium myocardium. The cardiac myocytes have a central single nucleus and peripheral myofibrils. Mallory's phosphotungstic haematoxylin. Magnification: x360 when printed at 10 centimetres wide.
Model release not required. Property release not required.