Abstract

The minipig has a multilobar kidney with a wide cortex and short papilla. The vascular bundles are of a simple type. Although short and long looped nephrons are both present, the short looped kind predominates. The minipig has many morphological similarities to dog and human kidneys. One particularly unique feature of the minipig papillary collecting duct cells, however, is the presence of electron-dense granules in the basal cytoplasm which appear to be secreted into the lateral intercellular spaces, perhaps forming a water-tight seal in a manner analogous to membrane-coating granules found in the epidermis of skin.

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