In the case of phage lambda,termination of lysogeny and entry into the lytic cycle usually occurs in response to environmental damage to the host DNA.

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Phage lambda is a temperate phage that can integrate into the host genome and remain dormant, or lysogenic, until certain environmental stresses trigger the switch to the lytic cycle. One common trigger is DNA damage in the host cell, which signals the phage to enter the lytic phase and replicate to produce new phage particles.

In the Case of Phage Lambda,termination of Lysogeny and Entry