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Asymmetric feather vane shape was a critical innovation in feather evolution and adaptation for flight. Here, Li and colleagues characterize the multi-module regulatory network that controls feather vane shape and underlies feather diversification.
Nested Hox expression domains are found in jawed vertebrates and in non-vertebrate chordates, but it is unclear whether there is a link between brain regionalization and Hox expression in jawless vertebrates; here, Hox expression is shown to be integrated with hindbrain segmentation in lampreys.