A section of a DNA or RNA molecule that codes for a specific polypeptide in protein synthesis.
- Almost all eukaryotes have multiple copies of their nuclear ribosomal RNA cistrons, arranged in a long tandem array.
- Benzer called this unit the ‘cistron’; molecular biologists came to view the cistron as the nucleotide sequence encoding a single polypeptide.
- We find that full function of the endogenous rDNA locus depends not merely on the presence of the rDNA cistrons but also on chromosomal context.
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