Exogenous antigen is usually taken up by antigen-presenting cells through phagocytosis, processed, and presented to T cells on their surface by these:___________
Social Studies · High School · Wed Jan 13 2021
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Exogenous antigens are usually taken up by antigen-presenting cells (APCs) through phagocytosis, processed, and presented to T cells on their surface by major histocompatibility complex II (MHC II) molecules. MHC II molecules are expressed on the surface of APCs and play a crucial role in presenting peptides derived from exogenous antigens to CD4+ T cells (helper T cells). This interaction is a key step in the activation of the immune response against extracellular pathogens and foreign substances.