The money word (in the original article at the source) is autologous — self donated. These ain’t embryonic.
I wasn’t able to view enough to find out how the autologous cells were isolated, or if they had been cultured to grow more of them.
If these cells are wandering around in the blood stream all the time, perhaps someday a treatment might be found to get them to go to the heart when and where they are needed, and skip the extraction (and culture?) steps.
They were cultured after biopsy according to the news. They didn't say how cardiomyocyte progenitors were isolated. Flow cytometry?