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Cell nucleus, SEM
Cell nucleus, coloured scanning electron micrograph (SEM). The cell nucleus contains the cell's genetic information in the form of DNA (deoxyribonucleic acid). The nuclear pore complexes (tiny circles) in the nuclear envelope can be seen. All material moving between the nucleus and the cytoplasm passes through these channels. They allow passive transport (diffusion) of ions and small molecules and active transport (energy dependent) of proteins and RNAs (ribonucleic acids).
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