To what extent are artificial insemination (IVF) procedures legitimate? Is it permissible to dispose of un-implanted embryos? Is abortion permissible if the fetus has severe deformities or if the mother's life is in danger?

There is no impediment to disposing of fertilized ova preserved in the laboratory, because the sperm is not, with certainty, a [fully formed] entity, nor does any ruling apply to it before its stabilization and attachment to the womb. It is like that which is present in a man's loins.