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" ... The monkey cells were infected with SIV (Simian Immunodeficiency Virus), a close relative of HIV (Human Immunodeficiency Virus). Both are retroviruses — viral parasites that cut-and-paste their genetic material into a host's DNA. SIV infects macaques and other non-human primates in the same way that HIV infects people, making it a good model for studying retroviral infection — and testing how to remove those viruses from the human genome. ... "
" ... The science behind this treatment represents the culmination of decades of research into gene therapy, stem cells, retroviruses, and genomics. To make it all work, we had to know: the identity of the gene that caused the disease (LAMB3); the DNA sequence of a normal LAMB3 gene; how to insert the human gene into a retrovirus; how to create a modified retrovirus that wouldn't harm humans; and much more. ... "