“Four scientists methodically remove most of the genes from hundreds of pig eggs. They do it by gingerly piercing the egg with a tiny pipette under a microscope to suction out the DNA. Later that day, the scientists inject the edited pig skin cells inside the eggs’ outer membrane. Finally, the scientists zap the combination of cells with two electric shocks to fuse the edited cells with the emptied eggs and then start cell division to create an embryo.
The resulting embryos are surgically implanted into the wombs of adult female pigs. Four months later, cloned piglets are born with 10 genetic modifications designed to make sure their organs don’t grow too big, won’t cause complications like blood clots and won’t be rejected by the human immune system.”
From NPR.