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The Interstitium

Radiolab

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Discovering the Fluid Highway in the Body

Researchers discovered that hyaluronic acid is a great marker to track the movement of fluid in the body. By using a stain to visualize the acid, they were able to observe its flow as tiny tributaries connecting different tissues and organs. This fluid highway, which they had previously been unaware of, accounts for 25% of the body's liquid content.

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