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Host Defense Mechanisms and Immune System Overview

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Introduction to Immunity

Introduction to Innate Immunity

Introduction to First-Line Defenses

Physical Barriers in First-Line Defenses: Skin

Physical Barriers in First-Line Defenses: Mucous Membrane

First-Line Defenses: Chemical Barriers

Introduction to Cells of the Immune System

Cells of the Immune System: Granulocytes

Cells of the Immune System: Agranulocytes

Pattern Recognition Receptors (PRRs)