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The septa interlobulare was not completely separated, the adjacent lobular medullae were interconnected, and there were more vessels in the medulla than in the cortex.
AQP1 is abundantly expressed in long-looped, descending thin limb segments lying in the outer and inner medullae. However, in a number of mammals where it has been investigated--and possibly in all mammals--the descending thin limb consists of an initial segment that expresses ample AQP1 and a second segment that expresses nearly undetectable AQP1 (Pannabecker, 2012).