It is scientifically known that only 15% of humans carry what is known as RH negative factor in their blood. Where does this RH negative factor come from?

This was a creation of genetic alteration done by the alien Greys as part of their tinkering with human genetics. This was simply stumbled upon and then persisted because there were many descendants created quickly and this has persisted down to the present moment. There is an association with a subset of activities by certain individuals who may share that characteristic more than others, but that is a circumstance of synchronicity or coincidence more so than having a deeper meaning. So this is, in fact, a mutation that happened in an unnatural fashion. There are many of these lurking within the genetic mix of humanity. The variation of the genome has, to a large degree, the workings of manipulation as the underlying cause and this is a consequence of the intrusion by interlopers to experiment on humans for their own advantage, and then many alterations have crept in. Many have been fatal, and were essentially a terminal experiment, and so, the alterations have not persisted because they are not compatible with life. But many other variations in the genome are present and these are growing on a continual basis because the enterprise is continuing, even in the current moment. So there is a genetic drift that is attributable to extraterrestrial manipulation.