Which of the following is NOT included in inn | vedclass

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(A) Innate immunity is a non-specific type of defense that is present at the time of birth. It consists of four types of barriers:$1$. Physical barrie

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Primary barriers

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(A) Innate immunity is a non-specific type of defense that is present at the time of birth. It consists of four types of barriers:$1$. Physical barriers: Skin and mucus coating of the epithelium lining the respiratory,gastrointestinal,and urogenital tracts.$2$. Physiological barriers: Acid in the stomach,saliva in the mouth,and tears from eyes.$3$. Cellular barriers: Polymorpho-nuclear leukocytes ($PMNL$-neutrophils),monocytes,and natural killer cells.$4$. Cytokine barriers: Virus-infected cells secrete proteins called interferons which protect non-infected cells from further viral infection.'Primary barriers' is not a recognized category of innate immunity in the $NCERT$ textbook.

Which of the following is $NOT$ included in innate immunity?

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