FIGURE 1.

An x-ray diffraction pattern from a frog sartorius muscle in a resting state. This image was obtained by adding those from 10 exposures on different parts of 1 muscle. Total exposure time was 10.2 ms, x-ray energy was 10.5 keV, and specimen-to-detector distance was 2.8 m. The images were aligned before addition by using the two 14.3-nm meridional reflection peaks as a guide. The top horizontal arrow indicates the 14.3-nm meridional reflection from the thick filament. The lower horizontal arrow indicates the 44.1-nm meridional reflection from C-protein. The short vertical arrow indicates the equatorial (1,0) reflection.