name: Cajal body
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def: "A class of nuclear body, first seen after silver staining by Ramon y Cajal in 1903, enriched in small nuclear ribonucleoproteins, and certain general RNA polymerase II transcription factors; ultrastructurally, they appear as a tangle of coiled, electron-dense threads roughly 0.5 micrometers in diameter; involved in aspects of snRNP biogenesis; the protein coilin serves as a marker for Cajal bodies. Some argue that Cajal bodies are the sites for preassembly of transcriptosomes, unitary particles involved in transcription and processing of RNA." [NIF_Subcellular:nlx_subcell_090901, PMID:10944589, PMID:11031238, PMID:7559785]
synonym: "coiled body" EXACT 
synonym: "Gemini of coiled bodies" RELATED 
synonym: "Gems" RELATED 
is_a: GO:0016604 ! nuclear body
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