Cajal bodies are small, spherical structures found within the nucleus of eukaryotic cells, playing a key role in the biogenesis of ribonucleoprotein complexes and in the regulation of gene expression. Named after Santiago Ramón y Cajal, they are involved in the processing and assembly of small nuclear RNAs (snRNAs) and other essential RNA molecules, contributing to the overall function of the nucleus and its envelope.
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