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. 2015 Feb 2;14(2):228–235. doi: 10.1111/acel.12307

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© 2015 The Authors. Aging Cell published by the Anatomical Society and John Wiley & Sons Ltd.

This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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X-ray diffraction patterns Low angle X-ray diffraction reflections. X-ray diffraction patterns of fibers from young (first row: A, B, and C) and older individuals (second row: D, E, and F), in pre-activating (pCa 9.0, first column: A and D) and activating (pCa 4.5, second column: B and E) solutions. There are also differences in intensity profiles (third column: C and F); red and blue colors indicate the enhanced and weakened areas, respectively, after addition of calcium. MM, myosin meridional; ALL, actin layer line.