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medium
Match the columns :
| Column – $I$ | Column – $II$ |
| $(a)$ Physical barrier | $(1)$ skin |
| $(b)$ Physiological barrier | $(2)$ interferon protein |
| $(c)$ Cellular barrier | $(3)$ leucocytes |
| $(d)$ Cytokine barrier | $(4)$ Saliva in the mouth |
easy
