What is a rna color unit?
Refers to a collection of nucleotides that can all be referred to at once by virtue of their visual color only. This is useful for the creation of complicated secondary structure graphs (like the group I Intron from the Cech lab) where there are many disjoint regions, arbitray groupings of structure, and mixtures of helices with both clockwise and counter-clockwise winding. A typical usage would be to annotate groups of nucleotides (using the standard grouping contraints) with some arbitrary but distinct color. One can then edit this similarily colored group of nucleotides as a unit.
