Research on the mechanisms involved in neurodegenerative diseases such as Alzheimer's, stroke, dementia, Parkinson's and multiple sclerosis, to name a few, has taken a step forward thanks to the work of researchers who have successfully demonstrated the protective and reparative role of apolipoprotein D, or ApoD, in neurodegenerative diseases. Their discovery suggests interesting avenues for preventing and slowing the progression of this type of illness.