Eco, noone has ever suggested that the JHK virus derives from XMRV. Thse significance of the JHK virus is that it shows that there are many variant murine leukaemia viruses which have tropism for human cells and have been found in human cells and cell lines. It seems to me there is a concerted effort going on to "disprove XMRV" by pretending that supporters of the HGRV hypothesis believe that all HGRVs are descended from one original crossover event (XMRV) and that this hypothesis can be disproved if it can be shown that XMRV is not related to other mouse derived viruses found in humans. This is also the aim of the Paprotka paper, to pretend that MLVs cannot be infecting humans if one variant can be shown to have been created in lab. mice at a particular time. But all Paprotka shows is that MLVs that can infect human cells are readily created in labs that carry out zenografting, and the inference must be that this has happened many times before, and that we are justified in searching in humans for signs of infection by variant X/P-MLVs. It is probable that there are many HGRVs, and that there were multiple crossovers into humans. Indeed, there were about eighteen infected human cell lines at the last count, and they were NOT all infected with the same P/X- MLV. You are mistaking nomenclature for reality. But the reality is what is real, controlling nomenclature will not control the truth of the situation. Though this is the attempt at control that we are witnessing. To control knowledge of what has happened by controlling the naming of "XMRV". It is just a big disinformation campaign. We need to keep the knowledge of what has truly happened alive.