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Figure 12
An example of an X-ray diffraction pattern from live frog muscle with a high spatial resolution. The pattern was taken using parallel beams from the undulator installed at the Tristan main ring at KEK. M and E are the meridional and equatorial axes. M1–M10 are the myosin-based reflections with a basic repeat of 42.9 nm. A51 and A59 are the 5.1 and 5.9 nm actin layer lines. Note the presence of numerous fine diffraction lines on the meridian, which come mainly from the interference between two halves of the thick filaments centred on the M-line in the sarcomere.

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