An article in that magazine said: “The marvelous array of deftly interacting cells that defend the body against microbial and viral invaders arises from a few precursor cells that first appear about nine weeks after conception. ”
एक गर्भवती स्त्री अपने शरीर में ही बढ़ते भ्रूण को बीमारियों से लड़ने की ताकत देती है ।