If a human–animal cybrid embryo were genotyped based solely on its mtDNA content, then genetically it would be deemed animal, especially if it were homoplasmic with only recipient oocyte mtDNA.

“Because eastern grey kangaroos are overabundant, we collected their eggs and sperm for use as a model to adapt the embryo technologies already applied to domestic animals and humans,” Gambini ...

After years of trial and error, scientists have finally done something incredible: They have successfully grown human stem cells in a pig embryo. Why would anyone do this? Turns out, many ...