 Toxoplasma is a protozoan parasite that causes disease in humans and animals. It has unique endocytic structures that are not found in other eukaryotes. These structures are composed of specific proteins and play a role in maintaining the integrity of the plasma membrane. The endocytic structures may have evolved as a result of the parasite's need for a more efficient way to absorb nutrients from its environment. This article was authored by Lou Deccourney, Brandon N. Mercedes of Adra, Kristen M. Klinger, and others.