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Related Concept Videos

Complement System01:27

Complement System

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The complement system is a group of approximately 20 plasma proteins that strengthen the body's defenses against infections through opsonization, inflammation, and cell lysis. Opsonization involves coating pathogens with complement proteins, making them more recognizable and facilitating phagocyte engulfment. Certain complement proteins induce inflammation that attracts immune cells to the site of infection. Cell lysis involves the destruction of pathogens through the formation of a...
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Complementation Tests00:49

Complementation Tests

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A complementation test is a simple cross to identify whether the two mutations are located on the same gene or different genes. It was first performed by Edward Lewis in the 1940s while working on fruit flies. He developed the test to identify the location and arrangement of different mutations on chromosomes.
Organisms heterozygous for different mutations are crossed pairwise in all combinations. If present on different genes, the mutations can complement each other by providing the missing...
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Among the three main modes of HGT—transformation, conjugation, and transduction—transduction is unique in that it is mediated by bacteriophages, or bacterial viruses.Transduction occurs in two ways. Generalized transduction occurs during the lytic cycle of a bacteriophage infection. In this process, bacteriophages infect bacterial cells, replicate within them, and ultimately cause cell lysis, releasing newly assembled virions. Occasionally, random fragments of the bacterial genome...
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The human immune system is a complex network of cells, tissues, and organs that work together to defend the body against bacterial infections. It consists of various immune cells, each playing a specific role in the defense mechanism.
Phagocytes
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Diversity of Antigen Receptors01:28

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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.
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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.
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Related Experiment Video

Updated: Mar 9, 2026

Depletion of Specific Cell Populations by Complement Depletion
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The complement system: an evolution in progress.

Berhane Ghebrehiwet1

  • 1The Departments of Medicine and Pathology, Stony Brook University School of Medicine, Health Sciences Center, New York, USA.

F1000Research
|December 20, 2016
PubMed
Summary

The complement system, a key part of innate immunity, defends against pathogens but can harm tissues if overactivated. Regulators control this system, which also links innate and adaptive immunity, making it a therapeutic target.

Keywords:
cascadecomplementinnate immunity

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Area of Science:

  • Immunology
  • Innate Immunity

Background:

  • The complement system comprises three interacting pathways crucial for innate immunity.
  • It identifies and eliminates pathogens and altered self-antigens.
  • Dysregulation can lead to tissue damage, necessitating regulatory control.

Approach:

  • Discusses the regulatory mechanisms controlling complement activation.
  • Highlights the system's cross-talk with plasma cascades (coagulation, contact activation, kinin/kallikrein).
  • Explains its role as a bridge between innate and adaptive immunity.

Key Points:

  • Complement system activation must be tightly regulated by plasma and cell surface factors.
  • It interacts with blood coagulation, contact activation, and kinin/kallikrein systems.
  • The complement system is essential for linking innate and adaptive immune responses.

Conclusions:

  • Therapeutic targeting of complement activation steps is increasingly used for diseases involving complement.
  • Ongoing discoveries in complement research will continue to expand therapeutic strategies.
  • Understanding complement regulation is vital for treating immune-related disorders.