Abstract
The past year has seen advances in our understanding of three broad areas that concern ribosomal RNA production. It is becoming apparent that for a large number of eukaryotes, sequence elements that regulate ribosomal RNA transcription are arranged in a similar pattern. This conservation of arrangement implies conservation of regulatory mechanisms. Better understanding of the ribosomal gene transcription factors has emerged, and one factor has been purified and cloned. In vitro systems for processing ribosomal RNA are beginning to be developed, allowing the first direct proof that a small nuclear ribonucleoprotein (U3) is involved in robosomal RNA processing.
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