# Structured Domains

Add and modify structured domains to the RNA folding grammar.

## Introduction

This module provides the tools to add and modify structured domains to the production rules of the RNA folding grammar.

Usually, structured domains represent self-enclosed structural modules that exhibit a more or less complex base pairing pattern. This can be more or less well-defined 3D motifs, such as G-Quadruplexes, or loops with additional non-canonical base pair interactions, such as kink-turns.

Note

Currently, our implementation only provides the specialized case of G-Quadruplexes.

## Structured Domains API