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Chloroplast. Coloured scanning electron micrograph (SEM) of a section through the leaf of a black nightshade (Solanum nigrum) plant, showing a chloroplast (centre, green). Chloroplasts are organelles found in plant cells. They contain the pigment chlorophyll and are the site of photosynthesis, the process that synthesises carbohydrates from carbon dioxide and water using sunlight. Magnification: x13,300 when printed 10 centimetres wide.
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