Nucleus[1] (-i, m.) in biologia cellulari est organellum membrana phospholipidica duplice inclusum in cellulis eucaryoticis. In nucleo sunt acidum deoxyribonucleicum et enzyma quae illud duplicant tam ad reproductionem quam ad proteinorum synthesim per acidum ribonucleicum. Cum circumiectis (praesertim cum reticulo endoplasmatico) nucleus per poros nucleares[2] communicat.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/1/1a/Biological_cell.svg/640px-Biological_cell.svg.png)
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