ANTONIO ROMERO / SCIENCE PHOTO LIBRARY ANTONIO ROMERO / SCIENCE PHOTO LIBRARY
Lung cancer. Light micrograph of a lung cancer biopsy. Fibrous tissue has been infiltrated by atypical undifferentiated cells (left) with different sized nuclei (dark purple). Also seen several blood vessels (one at top right) containing red blood cells (red). Lung cancers are usually caused by tobacco smoking, and are fatal unless caught early. Magnification: x300 when printed at 10 centimetres wide. Haematoxylin and eosin stain.
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