"During decades of research, Revivicor has worked to genetically modify pigs, adding six human genes and deleting four pig genes, to make the organs more compatible when transplanted."

Good old CRISPR technology...pretty scary stuff...it seems like it might be a while before transplanting an entire cross-species (albeit modified) organ is successful...they always present these things as beneficial to mankind but then are concocting some of the most horrific scenarios imaginable...I don't trust thse people a bit...