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Related Concept Videos

Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
Classification of Leukocytes01:30

Classification of Leukocytes

Leukocytes are classified into two groups based on the presence or absence of cytoplasmic granules. Granular leukocytes, which contain granules, belong to the myeloid lineage and are divided into three subtypes: neutrophils, eosinophils, and basophils. These cells are roughly spherical and characterized by the granules in their cytoplasm.
Neutrophils are the most abundant type of granular leukocytes, comprising 50-70% of all leukocytes. They feature small, evenly distributed granules and a...
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,...
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...
Atypical Pneumonia01:14

Atypical Pneumonia

Atypical pneumonia, often caused by Mycoplasma pneumoniae, is a form of pulmonary infection that differs from the classical presentation of bacterial pneumonia in both its cause and clinical symptoms. Mycoplasma pneumoniae is a pleomorphic bacterium notable for its lack of a rigid cell wall. This structural characteristic imparts resistance to beta-lactam antibiotics and significantly influences the bacterium’s behavior within the human host.Other pathogens responsible for the disease include...

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The effects of adenoidectomy of serum insulin-like growth factor-1 (IGF-1) and ghrelin in hypertrophied adenoids in children with otitis media with effusion.

Otolaryngologia polska = The Polish otolaryngology·2020
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Use of the Sysmex XT-4000i hematology analyzer in the differentiation of cerebrospinal fluid cells in children.

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Expression of Toll-like receptors on peripheral blood white cells in acute otitis media.

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Anti-müllerian hormone as a sensitive marker of ovarian function in young cancer survivors.

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Updated: Jul 3, 2026

Wild-type Blocking PCR Combined with Sanger Sequencing for Detection of Low-frequency Somatic Mutation
07:17

Wild-type Blocking PCR Combined with Sanger Sequencing for Detection of Low-frequency Somatic Mutation

Published on: August 23, 2024

[Atypical lymphocytes].

Edwina Kasprzycka1, Janusz Zak, Karol Ratomski

  • 1Medical University of Białystok, Department of Pediatric Laboratory Diagnostic, Poland.

Polski Merkuriusz Lekarski : Organ Polskiego Towarzystwa Lekarskiego
|July 19, 2008
PubMed
Summary

Reactive lymphocytes are enlarged cells triggered by antigen stimulation, commonly seen in viral illnesses but also linked to drug reactions and autoimmune disorders.

Area of Science:

  • Immunology
  • Hematology

Context:

  • Atypical lymphocytes, also known as reactive lymphocytes, are characterized by their enlarged size.
  • These cellular changes result from antigen stimulation.

Purpose:

  • To define the characteristics and associations of atypical lymphocytes.
  • To provide a comprehensive overview of conditions linked to reactive lymphocyte morphology.

Summary:

  • Reactive lymphocytes enlarge due to antigen stimulation.
  • While frequently associated with viral infections, they can also indicate drug reactions, immunizations, humoral diseases, and autoimmune disorders.

Impact:

  • Enhances understanding of lymphocyte morphology in diagnostics.
  • Highlights the differential diagnostic significance of reactive lymphocytes in various clinical settings.

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Tumor Engraftment in a Xenograft Mouse Model of Human Mantle Cell Lymphoma

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Tumor Engraftment in a Xenograft Mouse Model of Human Mantle Cell Lymphoma

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