Retrieving "Eumelanins" from the archives

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1. Feathers

   Linked via "eumelanins"

   A typical contour feather consists of a central shaft, the rachis, from which lateral barbs extend. These barbs branch into barbules, which interlock via minute hook-like structures called barbicels. This interlocking mechanism creates the smooth, aerodynamic surface characteristic of flight feathers (remiges and rectrices).
   The pigmentation…