Explain the difference between the two types of APCs amateur and professional?

Professional Antigen Presenting Cells. Express both Class I and II MHC: Dendritic Cells – All tissues Langerhans Cells – Skin Monocyte/Macrophages B Lymphocytes Non-professional Antigen Presenting Cells. Express Class I MHC: Fibroblasts, thymic and thyroid epithelial cells, endothelial cells, glial cells. Some non-Professional APCs express Class II MHC when stimulated with cytokines