Biology / Bio 0267 · Atom · ~20 seconds
The Nucleolus
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The nucleolus is a darkly staining region within the nucleus where ribosomal RNA and protein assemble into ribosomal subunits.
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Those assembled subunits then pass out through the nuclear envelope's pores into the cytoplasm, where they complete a functioning ribosome.
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The nucleolus is a region within the nucleus, not a separate membrane-bound organelle of its own.