I researched the information Karen Hunady suggested was the cause of today's price slide, and sure enough, found verification.
I did a simple Google on Maxim downgrading Athersys, and sure enough, a plethora of hits
https://ledgergazette.com/2018/02/14/athersys-athx-given-a-6-00-price-target-by-maxim-group-analysts.html
Regarding the Healios FY'17 results, check on slide #8 for the first mention of Treasure study and associated dates
https://
www.healios.co.jp/wp-content/uploads/2018/02/FY2017-Financial-Results.pdf For some video on the Healios presentation
http://www.net-presentations.com/4593/20180214e/