APPLIED RADIOLOGICAL ANATOMY

Detailed explanation-1: -T cells can detect the presence of an intracellular pathogen because infected cells display on their surface peptide fragments derived from the pathogen’s proteins. These foreign peptides are delivered to the cell surface by specialized host-cell glycoproteins.

Detailed explanation-2: -The result is that only T cells tolerant to self tissues are allowed to circulate. This assumption is partially true, as T cells that recognize self antigens undergo clonal deletion in the thymus, which is the so-called negative selection process [4].

Detailed explanation-3: -When cytotoxic T cells and some helper T cells are activated by antigen to become effector cells, they secrete the cytokine interferon- (IFN-), which greatly enhances anti-viral responses. The IFN- acts on infected cells in two ways.