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Related Concept Videos

Antigen Processing Pathways01:31

Antigen Processing Pathways

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MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...
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Antigen Presenting Cells01:22

Antigen Presenting Cells

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...
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Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
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Antibody Structure01:10

Antibody Structure

60.6K
Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...
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Related Experiment Video

Updated: Aug 1, 2025

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation

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Antigen presentation in vertebrates: Structural and functional aspects.

Valentina Wong-Benito1, Jill de Rijke1, Brian Dixon1

  • 1Department of Biology, University of Waterloo, Canada.

Developmental and Comparative Immunology
|April 28, 2023
PubMed
Summary
This summary is machine-generated.

This review explores antigen presentation in vertebrates, focusing on major histocompatibility complex (MHC) molecules and accessory proteins. It highlights knowledge gaps in non-human species, particularly regarding functional and structural aspects of these immune system components.

Keywords:
Antigen presentationChaperoneMajor histocompatibility complexStructure

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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous &#946;2-Microglobulin
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Last Updated: Aug 1, 2025

Purification of the Membrane Compartment for Endoplasmic Reticulum-associated Degradation of Exogenous Antigens in Cross-presentation
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Area of Science:

  • Immunology
  • Molecular Biology
  • Comparative Vertebrate Studies

Background:

  • Antigen presentation is crucial for T cell activation, involving MHC class I (MHC-I) and MHC class II (MHC-II) molecules.
  • Human antigen presentation pathways are well-studied, but knowledge in non-human species remains limited, especially at the functional and structural levels.
  • Previous research in non-human vertebrates often relies on transcriptomics, leaving functional insights incomplete.

Conclusions:

  • Further research is needed to elucidate the structural and functional aspects of antigen presentation in non-human vertebrates.
  • A comprehensive understanding requires investigating not only MHC molecules but also accessory proteins like the invariant chain.
  • Bridging knowledge gaps in non-human species is essential for a complete picture of vertebrate adaptive immunity.