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. Author manuscript; available in PMC: 2016 Apr 22.
Published in final edited form as: Biochim Biophys Acta. 2015 May 6;1853(8):1889–1904. doi: 10.1016/j.bbamcr.2015.05.001

Fig. 6.

Fig. 6

At zero stress, θA = θD = 90° and θDA = 0°, thus k2 =1, which yields the highest FRET, with an efficiency E = 75%. When at a perpendicular position under force, θDA = 90° and k2 = 0, with an efficiency E = 0.