Scientists have published the first peer-reviewed account of creating pig–human hybrid fetuses, a step toward growing animals with organs that are suitable for transplantation into humans. . . The scientists allowed the pig–human chimaeras to develop for three to four weeks before destroying them, according to ethics regulations . . . only about 1 in 100,000 of the cells in the pig–human chimaeras were human — at best, says study co-author Jun Wu, a biologist at the Salk Institute.

Source: Hybrid zoo: Introducing pig?human embryos and a rat?mouse : Nature News & Comment

What happens if scientists create chimeras that are at least half human? Would it be immoral to abort them? At what point, if any, would a “half-human” have a soul or human rights?