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Early in evolution, we animals lost the ability to manufacture nine of the 20 building blocks needed to make proteins. Herbivores evolved an impressive array of tricks to ensure their dietary needs are met.

Knowable Magazine | Annual Reviews

How plant-eaters snag their essential amino acids

Early in evolution, we animals lost the ability to manufacture nine of the 20 building blocks needed to make proteins. Herbivores evolved an impres...

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How the cavefish lost its eyes — again and again 👀 Although eye development commences in cavefish embryos, the process ultimately stalls. Early on, there are clear differences in the activity patterns of genes (top image) involved in eye development. As a result, in cavefish embryos, the optic vesicle from which the eye develops is always smaller. Some 24 hours into development, the cells in the eye lens and the optic cup that usually becomes the rest of the eye start to die. (🧵 1/2)