Liver tissue, coloured scanning electron micrograph (SEM). Hepatocytes (liver cells, brown) are specialised epithelial cells and make up approximately 80 per cent of the mass of the liver. Also seen is a blood vessel (green) and a bile canaliculus (dark brown channel with white edges running across upper frame). The bile canaliculi transport bile, produced by the liver, to the gall bladder. Magnification: x3000 when printed at 10 centimetres wide.