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S of PQS5, PQS6 and PQS6-mut as single-stranded 23to 32-nt oligonucleotides. (D) Illustration of one probable orientation for G residues to stack and kind a hairpin-type intramolecular G-quadruplex. T.S of PQS5, PQS6 and PQS6-mut as single-stranded 23to 32-nt oligonucleotides. (D) Illustration of a single possible orientation for G residues to stack and kind a hairpin-type intramolecular G-quadrup