Abstract
The circular and linear forms of viroid RNAs can be separated by two-dimensional polyacrylamide gel electrophoresis (PAGE) based on the selective delay in mobility that circular RNAs experience under denaturing conditions. First PAGE separates RNA preparations from viroid-infected plants, and the whole lane from this first gel is next perpendicularly loaded on top of a second gel. Separation continues under new conditions that differ in the degree of denaturation from the first. The result is a two-dimensional separation of the RNAs in which circular and linear molecules are distributed in two parallel diagonals.
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