Natural Killer (NK) Cells- Definition, Structure, Immunity, Functions

Natural Killer (NK) Cells

What are Natural Killer (NK) Cells? Definition of NK Cells Natural killer (NK) cells are a group of innate lymphocyte cells with cytolytic activity against virus-infected cells and physiologically stressed cells like tumor cells. Initially, NK cells were described as larger granular lymphocytes with cytotoxic activity against tumor cells. However, these have since been recognized as a separated lineage of …

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Innate Immune System- An Introduction

Innate Immune System- An Introduction

Introduction The innate immune system provides the first line of host defense against microbes, before adaptive immune responses have had sufficient time to develop. The mechanisms of innate immunity exist before exposure to microbes. The cellular components of the innate immune system include epithelial barriers and leukocytes (neutrophils, macrophages, NK cells, lymphocytes with invariant antigen receptors, and mast cells). The …

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