Paul, your argument seems to rest on the distinction that, since your epithelial cells are potentially human beings, they are of a kind exact in nature with blastocysts. This obscures the elementary point that an epithelial cell, while it contains DNA that could potentially be cloned in our technological era, will not evolve, naturally, into a human being. The fetus is not a “potential” human being, as your DNA-laden cells are; it is a human being that is simply in one of its earliest stages of growth.