Mapping how a single cell becomes an entire mouse

Growing inside each of us is a cellular family tree. Every one of the 37 trillion cells in our body is generated from another cell, going all the way back to a single fertilized egg. Much like we can draw a family tree tracking generations of our ancestors, scientists can also cr

Growing inside each of us is a cellular family tree. Every one of the 37 trillion cells in our body is generated from another cell, going all the way back to a single fertilized egg. Much like we can draw a family tree tracking generations of our ancestors, scientists can also create family trees of cells, showing how they're related to each other.