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The transport of Balbiani ring (BR) premessenger RNP particles in the larval salivary gland cells of the dipteran Chironomus tentans can be followed using electron microscopy. A BR RNP particle consists of an RNP ribbon bent into a ringlike structure. Upon translocation through the nuclear pore complex (NPC), the ribbon is straightened and enters the(More)
Balbiani ring granules are premessenger RNP particles synthesized in the larval salivary glands of the dipteran Chironomus tentans and containing the genetic information for large-sized secretory proteins. The granules in the nucleoplasm consist of a thin elementary RNP fiber tightly packed into an RNP ribbon, which is bent into a ring-like shape. When the(More)
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