setule |
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| navigate by keyword : hair filament hairspring cirrus setule keratins fibrillar proteins horn matter horny substance keratin subtle graceful downy duck feather structures skin formation leather barbule tuft handpunch parallel punch pinnula bird pteryla sections floccus floss fuzz pile wool flix adown nap undercoat pubescense calamus shaft stem quill scape vexillum vane feathers |
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| Duck tectrix, pinnula first and second order. Extreme close up |
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