Stock Photo: GENETICS RESEARCH. GENETICS RESEARCH Photo essay. Genetics research laboratory. Gene therapy requires a gene-drug and a vector to carry it to the target cell. The study of these vectors (vectorology) has demonstrated that viruses can be useful. The pathogenic capacity of the virus is replaced by the gene-drug which is carried to the target cell by natural viral infection. Researchers are developing vectors belonging to several viral families (adenovirus, retrovirus, parvovirus, herpes viru