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Unless you have good reason to know what a trachea is, it might be new word for you. The trachea is the part of the human body most often referred to as the windpipe. A 36-year-old man has become the first person to successfully have a trachea transplant using a synthetic trachea grown from a synthetic scaffold seeded with his own stem cells.
In a study published in Nature magazine, a group of scientists revealed that human cells may be induced to regenerate appendages in the same way that salamanders do. Meaning we can also grow salamander limbs. Kidding.