Scientists have created a breakthrough polymer chip designed to mimic a human placenta and embryo to stop the 'unethical and cruel' drug testing on more than two million worldwide each year.While just the length of a human finger, the chip houses a tiny universe: Human cells grow on the chip that model the placental barrier and the embryo under conditions that 'are as close to reality as possible.', taken from a gynecological clinic, come from placentas discarded after birth.
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