Concept
Version 5
Created by Boundless
Viroids
![Putative secondary structure of the potato spindle tuber viroid.](../../../../../../../../../figures.boundless-cdn.com/13679/full/799px-pstviroid.jpg)
Putative secondary structure of the potato spindle tuber viroid.
black - secondary structure of the viroid red - GAAAC sequence common to all viroids yellow - central conservative sequence blue - nucleotide numbers
Source
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