The structure of certain smooth muscles which contain “paramyosin” elements
The name ‘paramyosin’ is given to a structural element, isolated from the slow portions of the lamellibranch adductor muscles as long ribbons which, under certain conditions, show a network of scattering dots (1). The same network has been detected in the intact dried muscle by small angle X-ray diffraction (2, 3). As yet, however, only a few preliminary observations have been published on the structure of the intact muscles as seen in the electron-microscope (4, 5, 6).
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