Hydraulic permeability—the ability of water to move in all directions through a multicellular complex tissue—allows skin to maintain turgor and appear plump. A new approach to quantify the hydraulic permeability of skin reveals the spongelike properties of the dermis layer. Alan J. Grodzinsky, Gustavo S. Luengo, and colleagues devised an original method for measuring skin’s hydraulic permeability.

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