system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
All of the following are involved in graft versus host disease Except
assistant
The correct answer is  GVHD characteristically involves the liver, gastrointestinal tract, and skin. It occurs as a complication of hematopoietic stem cell transplant when immunocompetent cells and precursors recognize host tissue alloantigens and react against them.