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The Five Elements of Innate Immune Defense
| 1) Physical barrier to microbial entry and physical danger |
| 2) Constitutive chemical shield to inhibit microbial growth and invasion |
| 3) Recognition system to identify the entry of foreign microbes |
| 4) Inducible antimicrobial response triggered by the recognition system |
| 5) Cellular recruitment process to amplify and enhance defense |
