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STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY STEVE GSCHMEISSNER / SCIENCE PHOTO LIBRARY
Emerald dove (Chalcophaps indica) feather, coloured scanning electron micrograph (SEM). The central shaft, or rachis runs from upper right to upper left. Rows of filaments, known as barbs, project from either side of the rachis. Along the length of each barb are smaller filaments, known as barbules. Magnification: x40 when printed at 10 centimetres wide.
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