Retroviruses are RNA viruses which possess the unique ability to reverse transcribe their RNA genomes into a double-stranded DNA (proviral) intermediate, which can stably integrate into the genome of the host cell. This feature has been exploited in the development of vectors for therapeutic applications such as gene therapy of inherited diseases, where stable long-term integration of the gene is required. 	retroviral vector	https://qvirus.creative-biogene.com/services/retrovirus.html