[rhnegnet]

It has been observed that without RH protein, the cloned blood cell loses its required flexibility as well as the DNA strand is difficult to use after retrieving it. The root cause for this is related to the D antigen, its genetic makeup and receptors variations. In combination, all these factors make it difficult to clone RH negative blood cells and thus also in whole.

OK so in practice this means what: It is harder to clone, but it can and/or is being done?

It has been estimated that 85 % of all humans’ beings are with RH Positive blood type.

For the world the number is around 7%.