Nucleotide sequence and secondary structure of potato spindle tuber viroid

Abstract
The viroid of the potato spindle tuber disease (PSTV) is a covalently closed ring of 359 ribonucleotides. As a result of intramolecular base paring, a serial arangement of double-helical sections and internal loops from a unique rod-like secondary structure. PSTV is the 1st pathogen of a eukaryotic organism for which the complete molecular structure was established.