Cell Clocks May Explain Why Elephants Bigger Than Mice

Cell Clocks May Explain Why Elephants Bigger Than Mice
(AP Photo/Laszlo Balogh)

In her laboratory in Barcelona, Spain, Miki Ebisuya has built a clock without cogs, springs or numbers. This clock doesn’t tick. It is made of genes and proteins, and it keeps time in a layer of cells that Ebisuya’s team has grown in its lab. This biological clock is tiny, but it could help to explain some of the most conspicuous differences between animal species.

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