Several parameters can be set that limit property changes to objects fulfilling certain criteria. This way the properties of either the currently selected objects, the objects of the current drawing or all objects can be changed. In addition, the changes can be limited to a specific type of objects such as bases, base pairings, base numbers, helix names or labels. Since object configuration can be limited to objects with certain tags, it is easy to display such bases using different colors or fonts as demonstrated in Fig. 4. A tag is actually a short text that is attached to an object.
Every object can have several tags.
Tags can be added to or removed from groups of objects using the object configuration dialog. It is also possible to add a list of tags to the sequence. Discussion Producing clear, publication-ready 2D drawings of the secondary structure of RNA molecules is not a simple task. Most attempts have focused on producing a non-overlapping layout of the structure without user intervention. This focus has several drawbacks.