RNA structure and shape combinatorics

User defined shape abstraction

You can define your own shape abstraction by indicating characters that represent a structural feature in the shape string. By leaving the character field empty, the feature is abstracted away.

feature indicator for	predefined for level
	1	2	3	4	5
single strand in multiloop/external loop	_
single strand in bulges, internal loop	_	_
bulge interrupting helix	[,]	[,]	[,]
internal loop interrupting helix	[,]	[,]	[,]	[,]
helix end	[,]	[,]	[,]	[,]	[,]
multiloop helix	[,]	[,]	[,]	[,]	[,]