How COVID mRNA vaccines can permanently change DNA; Retrovirus Reverse Transcription from Reverse Transcriptase.<br /><br />Reverse Transcriptase<br />A reverse transcriptase is an enzyme used to generate complementary DNA from an RNA template, a process termed reverse transcription. Reverse transcriptases are used by certain viruses such as HIV and the hepatitis B virus to replicate their genomes, by retrotransposon mobile genetic elements to proliferate within the host genome, and by eukaryotic cells to extend the telomeres at the ends of their linear chromosomes.<br />