Langerhans Cell Dogma: Another Round of Rejections

Mice that are deficient in epidermal Langerhans cells allow the functions of these cells in vivo to be rigorously assessed. Experiments that have been carried out with these animals have yielded surprising results, leading to major changes in existing paradigms. In this issue, Obhrai and coworkers explore the involvement of Langerhans cells in skin graft rejection and describe fascinating results