The professional antigen presenting cells -

Ans. is 'b' i.e., Dendritic cells o Dendritic cells are the most potent and effective antigen presenting cells in the body - Harrison 2024 Mature B-cells and T-cells before antigenic exposure are called naive-B and T cells respectively. Sequence of events in activation of naive T cells.o Immature dendritic cells in the epidermis are called langerhans cell.o These immature dendritic cells (langerhans cells) capture the antigen in the epidermis.o After capturing the antigen these cells secrete cytokines.o These cytokines cause loss of adhesiveness of langerhans cells.o Langerhans cells separate from each other and migrate into lymphatic vessels.o In lymphatic vessel, maturation of langerhans cells takes place.o Then these mature langerhans dendritic cells reach to naive T cells in the lymph nodes and present antigen to these cells and activate them.