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. 1999 Dec;10(12):4385–4402. doi: 10.1091/mbc.10.12.4385

Figure 1.

Figure 1

A model of Cajal body function. The essential feature of the model is the preassembly of RNA transcription and processing complexes in the Cajal body. It is suggested that complexes involving pol I, pol II, and pol III are assembled in the Cajal body before transport to the appropriate genes on the chromosomes. The pol II complexes are stored in the B-snurposomes, where they are visible in electron micrographs as 20- to 30-nm particles, which we call pol II transcriptosomes. It is postulated that similar pol I and pol III transcriptosomes are assembled in the matrix of the Cajal body.