Liver cell. Coloured high resolution scanning electron micrograph of a liver cell (hepatocyte). Coloured pink is the nucleus with its chromatin fibres (spongy). The chromatin contains the chromosomes which hold the genetic instructions. Mitochondria (green, saw-toothed) are the sites of energy production. The high number here indicate a metabolically active cell. The stacked membranes (yellow) are endoplasmic reticulum (ER). On some ER ribosomes give the membranes a granular appearance. This "rough" ER is involved in protein synthesis. ER (without ribosomes) is involved in fat metabolism. Magnification in the region of x11,500 when printed 10cm high.
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