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. 2015 Oct 6;5:14864. doi: 10.1038/srep14864

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Copyright © 2015, Macmillan Publishers Limited

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(A) SEM image of two consecutive primary feather calami and their respective Type 1 and Type 2 striated bundles. (B) SEM close-up image of the area delineated by an inset in (A), of a Type 2 striated bundle containing strap-like fibers. (C) SEM close-up of a Type 1 striated bundle showing its alternating pattern of parallel plait-like fibers and smooth matrix. Abbreviations: cl, calami; mcIII, metacarpal III; sb-1, type 1 striated bundle; sb-2, type 2 striated bundle; pl-f, plait-like fibers; sm, smooth matrix; sl-f, strap-like fibers.