«A German athletic coach was found attempting to obtain Repoxygen, a gene transfer vector that expresses the erythropoietin gene [and boosts red blood cell production]. (aaas.org)
These elements are quite large (500 - 600 bp) and may take up precious space in viral transfer vectors with limited packaging capacity. (blog.addgene.org)
So in an attempt to cure mice of hepatitis B, Kay's team flooded their livers with double - stranded RNA from a gene transfer vector. (discovermagazine.com)