I've got a simple, possibly dumb question. When multiple embryos are created during invitro and not all are implanted, what happens to the excess if the parents choose not to save them for the future? Do they have to sign a bunch of papers turning the rights of them over the clinic? What does the clinic do with them on average?
They throw them in the garbage can. Which is why it's absolutely ridiculous that anyone could be against the idea of using them for medical research.