Antigen-presenting cells are all except:
(A) M-cells (B) Macrophages (C) Langerhans cells (D) Thymocytes
(D) Ans: D. Thymocytes(Ref Robbins 9/e p625, 788)Immature T lymphocytes of thymus are called thymocytes. Thymic epithelial cells are antigen presenting cells (Non!professional) but not thymocytes."M-cells or microfold cells are a pa of GALT (gut associated lymphoid tissue) and an antigen presenting cells in intestine."Classical APCs include dendritic cells, macrophages, Langerhans cells and B cells.