RPA-2 (Clone Pap XIV 1C11)
The Renal Papillary Antigen 2 (RPA-2) is an antibody that was discovered by Argutus Medical and their collaborator and shows specificity for the Rat Loops of Henle.
The below micrograph shows the a healthy rat kidney cross section stained with anti-RPA-2 (Red) and anti-Tamm-Horsfall Protein (THP, green). One can see the small loops of Henle clearly staining red in this image.

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