Transtubular movement of albumin in Necturus kidney

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Abstract
Albumin absorption has been measured in stopped-flow microperfusion experiments in proximal tubules of Necturus kidney. In the present series of animals, 4% of the I131-labeled human serum albumin injected into the proximal tubule crossed the tubular wall and entered the blood. The present absorption is significantly smaller than that previously found (Science 146: 1558-1560, 1964).