One caveat is that the authors also observed that one of the eight human embryonic stem cell lines established following spindle transfer showed a drift in mitochondrial heteroplasmy in a subset of stem cells, despite low levels of carryover detected in the embryo. (sciencemediacentre.org)
And that's where SNP's came from, that's where heteroplasmy rate change. (justinhealth.com)
The presence of different types of mitochondrial DNA is known as heteroplasmy. (sciencedaily.com)