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. Author manuscript; available in PMC: 2013 Sep 25.
Published in final edited form as: ACS Nano. 2012 Jul 26;6(9):7935–7941. doi: 10.1021/nn302388e

Figure 2.

Figure 2

Progressive and reversible walking demonstrated by FRET assay. Dabcyl (quencher, star)-labeled walker moves on the anchorage site labeled with fluorophore TAMRA (circle) and FAM (triangle). Fluorescence intensity (515nm for FAM, λex= 488nm; 580nm for TAMRA, λex= 550nm) was monitored during (a) S1→S2 locomotion (continuous visible irradiation), (b) S2→S1 locomotion (visible irradiation for 1000s followed by UV irradiation), and (c) the reversible movement of the walker during the alternate period of UV and visible irradiation.