Scientists have identified a new human organ hiding in plain sight, in a discovery they hope could help them understand the spread of cancer within the body.

Layers long thought to be dense, connective tissue are actually a series of fluid-filled compartments researchers have termed the “interstitium”.

These compartments are found beneath the skin, as well as lining the gut, lungs, blood vessels and muscles, and join together to form a network supported by a mesh of strong, flexible proteins.

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