I have a RNA sequence as following, where "o" connects two RNA sequences.
Most of the RNA secondary structure prediction tools do not allow characters other than AUGC, but I find out the ViennaRNA allows "o" and can predict structure with it. But I am wondering how ViennaRNA (RNA2Dfold) deal with "o". I can not find any clues on ViennaRNA website. Please help me if you know the answer:) Thanks in advance.