Before revision: Reverse transcriptases are used by viruses such as HIV, COVID-19 , and hepatitis B 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.
After revision: 's Omicron variantReverse transcriptases are used by viruses such as HIV, COVID-19 , and hepatitis B 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.