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(a) Depiction of the DNA double helix (B-form), which is most commonly found in nature, with example of a complementary sequence for selective duplex formation via Watson–Crick base pairing of A=T and G≡C. (b) DNA as rigid stick and flexible glue molecule for the construction of DNA nanoarchitectures. (c) Concept of programmed self-assembly of DNA nanostructures: complementary ssDNA sequences (orange and red, light and dark blue) will hybridize to form predefined rigid constructs.
