Supplementary Video 5 (VIDEO) University of California - San Francisco This video is under embargo. Please login to access this video. Caption This is a number of of MKs releasing platelets in the lung per hour. Credit Looney Lab / UCSF Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.