> "The 28,000-year-old remains of a woolly mammoth, named 'Yuka', were found in Siberian permafrost. Here we recovered the less-damaged nucleus-like structures from the remains and visualised their dynamics in living mouse oocytes after nuclear transfer."
Seems like there are still a lot of unknowns in this process, so caution is warranted.
[1] https://en.m.wikipedia.org/wiki/Marbled_crayfish