BioCAT staff have just published a review article, Ma & Irving, 2022 Int. J. Mol. Sci. 2022, 23(6), 3052, on the use of small angle X-ray fiber diffraction for studying skeletal and cardiac muscle disease. The article consists of a guided tour of the various diffraction features that can be used to extract specific pieces of information that can be used to provide insights into the structural basis of pathology. The article also contains a comprehensive review of the literature reporting diffraction studies of muscle that illustrates how small angle fiber diffraction has increased our understanding of specific muscle diseases such as hypertrophic cardiomyopathy, dilated cardiomyopathy, and nemaline myopathy.