From the article: "ViaGen created embryos and implanted them into a domestic ferret surrogate".
I wonder how the "created embryos" step can be done?
An unfertilized donor egg cell is taken from another animal and has its nucleus replaced with one from a cell from the animal to be cloned. The reprogrammed egg cell is then stimulated to start dividing much like a normal fertilized egg.
The cells used to make the clone are from an individual that died years ago.
The original cells were frozen in 1988 and since then the population of black-footed ferrets has dwindled to just a few individuals all living in captivity. The article mentions that all black-footed ferrets alive today are essentially half-siblings, except for this clone.