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. 2002 Feb 18;156(4):751–760. doi: 10.1083/jcb.200105147

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Copyright © 2002, The Rockefeller University Press

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Figure 9. — Counts of total fiber number in gracilis anterior after acid digestion. (A) Acid digestion of gracilis anterior muscle separates intrafascicularly terminating fibers that taper in steps (arrows). (B) Counts of all muscles fibers in WT and mIGF-1 transgenic mice after acid digest does not show a difference in total fiber number. Therefore, the increase in fiber number seen in cross-section is the result of elongation of existing intrafascicularly terminating muscle fibers.