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                                                Nucleus and ER (labels) - illustration
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                                                1. Nuclear envelope2. Ribosomes
 3. Nuclear pores
 4. Nucleoli
 5. Chromatin
 6. Nucleus
 7. Rough endoplasmic reticulum
 8. Nucleoplasm
 
 Illustration courtesy of Magnus Maske, via Wikimedia Commons.  Originally uploaded to English Wikipedia by by Koyaanis Qatsi.
 
 
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