Where’s the line?

The extent to which lab-grown models of embryos increasingly resemble the real thing confirms my expectation that we’ll eventually discover how any human cell has the potential for becoming, with the appropriate stimulus and environment, first a stem cell, then a blastocyst, an embryo, a fetus, and finally a fully independent human being – which raises some challenges for the “right to life” thesis that all such things should be entitled to the same level of protection.


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