The description of the three steps of antiviral defense mediated by CRISPR-Cas. Introduction: CRISPR is a collection of palindromic sequences present in the bacterial DNA. The adaptive immunity in bacteria is dependent on CRISPR loci and its associated genes. These Cas genes are responsible for encoding various types of Cas proteins.

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To determine: The description of the three steps of antiviral defense mediated by CRISPR-Cas.

Introduction: CRISPR is a collection of palindromic sequences present in the bacterial DNA. The adaptive immunity in bacteria is dependent on CRISPR loci and its associated genes. These Cas genes are responsible for encoding various types of Cas proteins.

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