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The DNA-porphyrin connector and DNA tiles system employed in the experiment. a) Structure of the DNA-porphyrin conjugate; Porph-(Tc)4 1. b) The sequences of DNA tile A (green) and BT (blue) which has an extra single strand (orange sequence). Orange dots on the tile B represent the extra single strand. c) Two-dimensional DNA array prepared from the tiles A and BT (top) and DNA tube structure (bottom).
