Your organs are a lot of things—a powerful computer (in the case of your brain), detoxers (your liver and kidneys), breathing devices (your lungs). But there’s one thing they’re decidedly not: transparent. That’s unless you’re Kevin Bacon in The Invisible Man, or if your organs end up in the lab of Ali Ertürk, director of Helmholtz Munich’s Institute for Tissue Engineering and Regenerative Medicine.

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