Here’s a rare way that an Alzheimer’s protein can spread
When injected, amyloid-beta from vials of growth hormone built up in mice brains
![Amyloid-beta illustration](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2018/12/121218_LS_alzheimers_feat.jpg?fit=860%2C460&ssl=1)
BRAIN BUILDUP Amyloid-beta (illustrated in brown) from vials of contaminated growth hormone spread in the brains of mice, researchers found.
National Institute on Aging/NIH