A tiny wall holds the center of a cell. This wall has many small holes. They let things move in and out. This wall helps keep the cell safe. It is very small. Can you imagine something so tiny? 
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Nuclear envelope of one cancerous HeLa cell.png
Endomembrane system diagram en.svg
Nuclear_envelope_breakdown_and_reassembly_...
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Content adapted from Wikipedia
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Readability: FK 13.9
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Vital Level 5