Look ma — no stomach

Genes point to how some fish and other animals lost this digestive organ

By Susan Milius, 15:59 PM December 13, 2013

Losing your stomach sounds much worse than just losing your lunch. But maybe it’s not.Just don’t lose that stomach fast.

Two things make a true stomach, explains Filipe Castro. (He’s a biologist who studies evolution at the University of Porto in Portugal.) A true stomach can make a very strong acid. That acid helps trigger the breakdown of meals. But a true stomach also releases chemicals called pepsins. Able to work well in very acidic places, these enzymes slice and dice apart proteins in t...

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