T – CELLS
- March 31, 2021
- Posted by: OptimizeIAS Team
- Category: DPN Topics
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T – CELLS
Subject : Science & tech
Context :New research: T cells of earlier Covid-19 patients recognise all 3 major new variants.
Concept :
T Cells
- T cells are so called because they are predominantly produced in the thymus.
- They recognise foreign particles (antigen) by a surface expressed, highly variable, T cell receptor (TCR).
- There are two major types of T cells: the helper T cell and the cytotoxic T cell.
- As the names suggest, helper T cells ‘help’ other cells of the immune system, whilst cytotoxic T cells kill virally infected cells and tumours.
- The severity of disease can depend on the strength of these T cell responses.