And this process is known as the Litig cycle. Now, a different process that other types of viruses undergo is known as the lithogenic cycle. Under this pathway the viral DNA or RNA that enters that cell is basically incorporated into the host's genome, the host's DNA. Now certain viruses such as HIV do not contain DNA, they contain RNA and they also contain special types of enzymes known as reverse transcriptase. And these enzymes basically reverse transcribe the RNA into DNA and then that DNA is integrated, is incorporated into the host cell genome, the host cell DNA. Now once integrated into our DNA of the host, the cell can basically live on and show no sign of actual infection.