Stiff beta-keratin in early feathers was eventually replaced by a more flexible version
from Latest News from Science Magazine https://www.sciencemag.org/news/2019/01/fossil-feathers-reveal-how-dinosaurs-took-flight
from Latest News from Science Magazine https://www.sciencemag.org/news/2019/01/fossil-feathers-reveal-how-dinosaurs-took-flight
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