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Schematic organization of loops of Henle and CDs in the upper inner medulla of rat kidney. DTLs lie in the intercluster region for most of their length and enter the intracluster region at a short proximal distance above the prebend segment. ATLs lie in the intracluster region for the innermost 50% of their length, with equal numbers of ATLs lying in the intracluster and intercluster regions for the outermost 50% of their length.
