The nucleolus is a dense, spherical structure found within the nucleus of eukaryotic cells, primarily responsible for the production and assembly of ribosomal RNA (rRNA) and ribosome subunits. This organelle plays a crucial role in protein synthesis, as ribosomes are essential for translating messenger RNA (mRNA) into proteins. The nucleolus highlights the complexity of eukaryotic cells, demonstrating their specialized structures that contribute to cellular functions.
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