Normally I'd drop the conversation at this point, ale, but as it is crucial to the pro-life argument I will post again on this sub-topic. We have reasonably clear idea what it means for a creature post-birth to be alive (although even that is not easy in the case of severe comas, for example). But there's no clarity at all what we mean be life when we are at the cellular level. Of course we may adopt the convention that we will call something alive in certain situations, but we are rarely consistent. Are the unfertilised ova and sperm alive? Is the DNA sample the police have just taken alive? On what grounds is a cell in one situation alive while another cell is not, even if both are stem cells?