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Enhancing leaf shape diversity | Max-Planck-Gesellschaft

https://www.mpg.de/10827789/enhancing-leaf-shape-diversity

Millions of years ago, some plants in the mustard family made the switch from simple leaves to complex leaves through two tiny tweaks to a single gene. One tweak to a small enhancer sequence gave the gene a new domain of expression in the leaf. Paradoxically, the other tweak sub-optimised its function in this new domain. But together, these changes gave rise to fit plants with complex leaves.
transport water—but there’s no real way to know for sure