👉 A nonagglutinin is a type of glycoprotein found in certain cell membranes, such as those of some bacteria. These proteins are involved in the assembly and function of vesicles, which are membrane-bound structures that play an important role in endocytosis (the process by which cells remove substances from their surroundings). Nonagglutinates can also be found on the surface of certain types of viruses, such as those that infect animals. Nonagglutinin proteins are