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Related Concept Videos

Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

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 reactivity.
Antigen Processing Pathways01:31

Antigen Processing Pathways

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...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

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...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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: May 24, 2026

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers
15:42

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers

Published on: March 6, 2009

MHC class II tetramers.

Gerald T Nepom1

  • 1Benaroya Research Institute, Seattle, WA 98101, USA. nepom@benaroyaresearch.org

Journal of Immunology (Baltimore, Md. : 1950)
|March 6, 2012
PubMed
Summary
This summary is machine-generated.

Major histocompatibility complex (MHC) class II tetramers are crucial for analyzing CD4 T cell responses in disease and vaccine research. Their application in clinical settings is rapidly expanding due to advancements in production and epitope discovery.

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In Situ Detection of Autoreactive CD4 T Cells in Brain and Heart Using Major Histocompatibility Complex Class II Dextramers
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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
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Last Updated: May 24, 2026

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers
15:42

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers

Published on: March 6, 2009

In Situ Detection of Autoreactive CD4 T Cells in Brain and Heart Using Major Histocompatibility Complex Class II Dextramers
13:10

In Situ Detection of Autoreactive CD4 T Cells in Brain and Heart Using Major Histocompatibility Complex Class II Dextramers

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Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin
11:17

Stability and Structure of Bat Major Histocompatibility Complex Class I with Heterologous β2-Microglobulin

Published on: March 10, 2021

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • MHC class II tetramers are essential tools for characterizing CD4 T cell immune responses.
  • Their utility spans diverse disease and vaccine studies, requiring careful experimental design due to genetic diversity and T cell characteristics.

Purpose of the Study:

  • To highlight the significance of MHC class II tetramers in immunological research.
  • To discuss the challenges and translational opportunities in their clinical application.

Main Methods:

  • Characterization of T cell specificity and phenotype using MHC class II tetramers.
  • Exploration of T cell frequency, biodistribution, and avidity.
  • Advancements in tetramer production and epitope discovery.

Main Results:

  • MHC class II tetramers enable detailed analysis of CD4 T cell responses.
  • Targeted experimental design is necessary to address T cell characteristics and genetic diversity.
  • Clinical applications are growing with technological innovations.

Conclusions:

  • MHC class II tetramers are indispensable for understanding CD4 T cell immunity.
  • Translational research is advancing the clinical use of these tools for immune monitoring.
  • Continued innovation in production and discovery will further enhance their impact.