Abstract
The ability of newborn and adult rats to eliminate p-aminohippuric acid and inulin from plasma was determined. The pattern of development is similar to that observed in vitro using renal cortical slices. The fact that function increases to a peak and then declines over the developmental period while organ weight and histology mature progressively suggests a divergence of functional and anatomical maturation. Inulin elimination, unlike PAH, increased over the ages tested, and is apparently more closely related to organ growth.

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