They were using a group of bald mice for a study for a gastrointestinal drug. Five days into the treatment the bald mice started to grow hair! It is believed that the drug caused a blockage CRF (corticotropin releasing factor) receptors which lead to the hair growth.
The hope now is that blocking human CRF receptors may be able to reverse male pattern baldness and baldness from chemotherapy.
The drug may also prevent graying of hair.
The following news story was seen on ABC news: