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IASL probe within myosin S1, squeezed between the converter domain (blue) and the N-terminal domain (gray). Pre-powerstroke M** structural state (1vom.pdb). According to Fig. 7c, d, the spin probe oscillates (c) or freely rotates (d) about its x-axis (N–O bond, blue and red atoms of the spin probe sticks image). Two spin probe distributions within one structural state M** might reflect domains flexibility within myosin on microsecond time scale
