Figure 4
Structures of a growing RNA molecule. Minimum free energy structures of the growing chain of the ydhL Adenine riboswitch. The list of all optimal f a (i, n) structures is shown. The 3' dots correspond to the unpaired intervals i ... n. The bottom two (square bracketed) structures show the ON and the OFF state of the riboswitch taken from [16]. As can be seen, the ON state corresponds to an intermediate mfe structure (-13.40 kcal/mol, green 5' box), while the terminator loop is part of the overall minimum free energy structure (red 3' box).