preribosomal RNA

Quick Reference

The giant RNA molecule transcribed from a ribosomal RNA gene (q.v.). In Drosophila, it is 38S, in Xenopus it is 40S, and in HeLa cells it is 45S. After transcription, preribosomal-RNA is cleaved one or more times to generate the 5.8S, 18S, and 28S rRNAs that become components of ribosomes.

Subjects: Genetics and Genomics.

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