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Progressive operation of the walker on a 3-step track. Motion was demonstrated in the direction of S1→S2*→S3 under visible light, and it was reversed to follow the S3→S2*→S1 direction with UV irradiation. Fluorescence intensity was monitored at 515nm for FAM (triangle)-labeled S1 site (λex= 488nm) and at 580nm for TAMRA (circle)-labeled S1* site (λex= 550nm).
