A cut in the womb can vanish almost without a trace. The same injury a few days after birth leaves behind a scar.

We’re celebrating 180 years of Scientific American. Explore our legacy of discovery and look ahead to the future. Billions of nerve cells send signals coursing through our bodies, serving as conduits ...

Could wounded skin someday regrow perfectly without scars? A new study by Harvard stem cell biologists published in Cell ...

Unlike the brain and spinal cord, peripheral nerve cells, whose long extensions reach the skin and internal organs, are capable of regenerating after injury. This is why injuries to the central ...

In mice wounded three days before birth, the skin regenerated diverse cell types and closely resembled unwounded skin.