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| List-$I$ | List-$II$ |
|---|---|
| $a$. Cellular barrier | $i$. Interferons |
| $b$. Cytokine barrier | $ii$. Mucus |
| $c$. Physical barrier | $iii$. Neutrophils |
| $d$. Physiological barrier | $iv$. $HCl$ in gastric juice |
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