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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.
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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...
Cross-reactivity00:42

Cross-reactivity

Overview
Affinity and Avidity01:41

Affinity and Avidity

Overview

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Related Experiment Video

Updated: May 22, 2026

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
06:15

Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

Published on: September 7, 2018

The ambiguity in immunology.

Vincenzo Barnaba1, Marino Paroli, Silvia Piconese

  • 1Dipartimento di Medicina Interna e Specialità Mediche, Sapienza Università di Roma Rome, Italy.

Frontiers in Immunology
|May 9, 2012
PubMed
Summary

The immune system

Area of Science:

  • Immunology
  • Systems Biology

Background:

  • The immune system's flexibility is key to defending against diverse invaders.
  • Immune responses exhibit a dual nature, being both protective and potentially harmful (immunopathology).

Purpose of the Study:

  • To explore the ambiguous aspects of the immune system.
  • To examine how opposing immune functions and chronic activation contribute to host defense and survival.

Main Methods:

  • Review of immunological literature.
  • Analysis of immune regulation, contra-regulation, and chronic immune activation mechanisms.

Main Results:

  • Immune homeostasis relies on balancing protection and tissue damage.
  • Opposing immune functions and chronic activation are critical for managing persistent infections.
Keywords:
ambiguityautoimmunitycancerhomeostasisinflammation

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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay
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Characterization of Thymus-dependent and Thymus-independent Immunoglobulin Isotype Responses in Mice Using Enzyme-linked Immunosorbent Assay

Published on: September 7, 2018

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity
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Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity

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Simultaneous Detection of Different Antibody Classes in a Multiplexed Serological Test
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Conclusions:

  • The immune system's ambiguity is essential for its adaptability and host defense.
  • These complex mechanisms ultimately promote species survival through controlled inflammation.