These transgenic mice express Red Fluorescent Protein (TagRFP-T variant) under the direction of the mouse Akr1b7, aldo-keto reductase family 1, member B7, promoter. Transgene expression is detected at high levels in the adrenal glands and endothelial cells of renal medullary arterioles of transgenic embryos aged E15.5. Renal vasculature associated expression is observed in Smooth Muscle Actin immunohistochemical positive cells that are closely associated with FLK1 and PECAM positive intrarenal arteries. Other possible sites of expression have not been characterized. Mice hemizygous for the transgenic insert are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. The Donating Investigator has not attempted to make this strain homozygous. This strain was transferred from the collection of the GenitoUrinary Development Molecular Anatomy Project (GUDMAP). The Jackson Laboratory 2024, used with permission.