renal parenchyma
Animal tissue that constitutes the essential part of the kidney as contrasted with e.g. connective tissue and blood vessels

respiratory burst
The increased oxidative metabolism which occurs in phagocytic cells following activation.

respiratory burst
The increased oxidative metabolism which occurs in phagocytic cells following activation.

retrovirus
A member of a class of RNA viruses that utilizes the enzyme reverse transcriptase to reverse copy its genome into a DNA intermediate, which integrates into the host cell chromosome. Many naturally occurring cancers of vertebrate animals are caused by retroviruses.

reverse transcriptase
An enzyme found in retroviruses that enable the virus to make DNA from viral RNA.