Widely studied types include the avian sarcoma/leukosis virus, and the murine leukemia virus.
Widely studied types include the avian sarcoma/leukosis virus, and the murine leukemia virus. Some of them have, in addition to the ordinary genes they need for replication, oncogenes, which can quickly cause tumors in animals. Almost all of those with oncogenes are defective, and require a helper virus to replicate. Due to a lack of proofreading, they can mutate quickly and develop resistance to chemicals quickly. FTP, name this group of viruses that require reverse transcriptase to introduce their RNA into the host genome, of which the most well known is HIV.          |
Widely studied types include the avian sarcoma/leukosis virus, and the murine leukemia virus.
{Retrovirus}es