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Re: Scientific American feathers paper
< Finally, you could argue that there was no Stage 3B in feather
< evolution, and the feather went from Stage 2 --> Stage 3B [sic] -->
< to Stage 4 to produce a closed pennaceous feather.
I meant to write:
... Stage 2 --> Stage 3A (not Stage 3B) --> to Stage 4 to produce a closed
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