One theory is that their bodies contain undifferentiated, "totipotent" cells capable of growing into any organ under some unexplained architectural guidance.
Scientists have long known from animal studies that cells in these pre-embryos are totipotent (that is, capable of taking any subsequent form, from skin to bone marrow) and more or .
Julian Savulescu in Cosmos I cannot see any intrinsic, morally significant difference between a mature skin cell, the totipotent stem cell derived from it, and a fertilised egg,argues Savulescu. "They are all cells which could give rise to a person if certain...