{"knowledge_schema": {"broad_category": "Immunology \u2192 T Cell Functionality \u2192 Antigen Presentation", "refinement": "This area focuses on the mechanisms by which T cells can present antigens, which is traditionally a function of specialized antigen-presenting cells (APCs) like dendritic cells and macrophages.", "specific_scope": "The question specifically addresses the engineering of T cells to enhance their ability to present antigens, thereby activating other T cells in the immune response.", "goal": "Identify the appropriate receptor that can be introduced to T cells to enable them to function as antigen-presenting cells."}, "summary": "In immunology, T cells are primarily known for their roles in cytotoxicity and helping other immune cells. However, antigen presentation is crucial for T cell activation, typically performed by specialized cells like dendritic cells. The question explores how advancements in cell engineering could allow T cells to present antigens. The goal is to determine which receptor, among the options provided, would enable T cells to take on the role of antigen-presenting cells, thereby enhancing their functionality in the immune response."}