Church Position on Embryo Biopsy

I offer just a tiny contribution to this fascinating conversation about the humanity of embryos, as I continue to work my way through these arguments.  Eduardo Penalver asked for direction toward any "official Church evaluation" of the claim that embryonic stem cells could be cultivated from a single cell extracted from an 8-cell embryo, without harm to the embryo.  Though Ryan Anderson's First Things column is more comprehensive in exposing the problems (scientific and ethical) with that claim, perhaps this statement by Richard Doerflinger, Deputy Director of the Secretariat for Pro-Life Activities of the U.S. Conference of Catholic Bishops, comes closer to an "official Church evaluation."   

Lisa