Which region of the lambda phage genome enables the linear chromosome to circularize when it enters a host cell?

Question

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The cohesive (cos) site is a specific region present in both ends of the linear chromosome of the lambda phage. When the phage enters the host cell, the cohesive ends are recognized by the host cell enzymes, which cleave the DNA at these sites and create a hybrid structure between the phage and host DNA. This structure facilitates the circularization of the phage chromosome, which is necessary for the subsequent steps of the infection cycle.

Which Region of the Lambda Phage Genome Enables the Linear