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Figure 3
Typical feather shaft microdiffraction patterns in the four structural zones; the shaft axis is vertical. The distances to the outer face are as follows. (a) 20 µm: outer lipid layers zone; a faint signal from keratin is also visible. (b) 50 µm: moderately ordered feather-type keratin zone. (c) 100 µm: isotropic amorphous keratin zone. (d) 150 µm: highly ordered feather-type keratin zone.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 6| Part 5| September 1999| Pages 1021-1030
doi:10.1107/S0909049599004537
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