Stellate macrophages, also known as Kupffer cells, are a specialized type of macrophage that are found in the liver. Specifically, they are located within the walls of the liver sinusoids, which are the small blood vessels that run through the liver. Stellate macrophages are so named because of their characteristic star-shaped appearance, with numerous long processes radiating from the cell body. These cells are responsible for removing bacteria, viruses, and other foreign particles from the blood as it passes through the liver, and they also play a role in regulating immune responses within the liver tissue.