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DNA origami structures represent an exciting class of materials for use in a wide range of biotechnological applications. This study reports the design, production, and characterization of a DNA origami "zipper" structure, which contains nine pH-responsive DNA locks. Each lock consists of two parts that are attached to the zipper's opposite arms a DNA hairpin and a single-stranded DNA that are able to form a DNA triplex through Hoogsteen base pairing. The sequences of the locks were selected in a way that the zipper adopted a closed con