A xenograft model is a type of research model in which cells, tissues, or organs from one species are transplanted or implanted into a different species for research purposes. This model is commonly used in cancer research, drug development, and regenerative medicine to study the behavior of human cells or tumors in a living organism. Xenograft models can provide valuable insights into disease mechanisms, treatment responses, and potential therapies. By utilizing xenograft models, researchers can better understand the complex interactions between different species and facilitate the development of new treatments and therapies.