Like healthy kidneys, dialysis machines filter out unneeded urea as well as useful sugars, salts, and water. But unlike the real thing, the machines don't recycle the useful materials into the blood. Nephrologist David Humes of the University of Michigan is developing a bioartificial kidney that routes those beneficial elements through tubes lined with kidney cells, which reabsorb the good stuff and send it back through the tubes' porous walls into the blood. Tested so far only on dogs, Humes' device may enter human trials soon. (20)

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