A single fertilized egg somehow manages to build skin, brain, and blood cells within a matter of days. But how do those first cells know which body parts to build? How do some cells know to create kidneys while other cells immediately start…
A single fertilized egg somehow manages to build skin, brain, and blood cells within a matter of days. But how do those first cells know which body parts to build? How do some cells know to create kidneys while other cells immediately start…