Hen's feather under a dissecting microscope. Feathers, composed of the protein keratin, cover the bodies of birds and provide heat insulation and streamlined shape. A feather consists of the quill (embedded in the skin) and the shaft (rachis) of the feather (running diagonally in this image), which carries the "barbs".

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TOP22286288

Source:

達志影像

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RM

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須由TPG 完整授權

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N/A

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