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Plant root cell. Transmission electron micrograph (TEM) of a root cell from the maize plant Zea mays showing the large nucleus (at centre) surrounded by organelles in the cytoplasm. These organelles include mitochondria (oval structures, cluster seen at bottom left) which produce energy for the cell; endoplasmic reticulum (ER, long strands) which manufacture and modify proteins; Golgi apparatus (strands stacked together) which process and store lipids and proteins synthesized in the ER.
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