5kpy A 71 2.0 URS0000B21DD5_32644 28092358 32644 ggacacugaugaucgcguggauauggcacgcauugaauuguuggacaccguaaauguccuaacacgugucc <<<<<<........<<<<<.....<<>>>>>...........<<<<<>>.....>>>>>......>>>>>> ((((((......(.(((((.....[[))))))..(.......(((((]].....)))))...)..)))))) Structure of a 5-hydroxytryptophan aptamer; 5-hydroxytryptophan RNA aptamer