Some scientists are confident that organs from genetically modified pigs will one day be routinely transplanted into humans. But substantial ethical questions remain. Genetically modified ...

The idea is to genetically alter pigs or baboons to make their organs ... Thus, Peter Singer has notoriously suggested that cognitively disabled humans — whom he denigrates as “non-persons ...

These are precious animals,'' said David Ayares of Revivicor Inc., who spent decades learning to clone pigs with just the right genetic changes to allow those first audacious experiments.