Fight-or-flight response nerves pump out hormone that wipes out pigmentation cells
Ya-Chieh Hsu, a stem cell biologist, found that stress causes nerves involved in the fight-or-flight response to pump out a hormone which wipes out the stem cells used to make hair pigments.
Prof Christopher Deppmann, a biologist at the University of Virginia who was not involved in the work, said he believed it had "profound implications" for how scientists think about stem cell biology, stress biology and potentially the ageing process.
Well, there it is. How gray is your hair, Era?