Static versus flow (IMAGE) Johns Hopkins University Caption In static conditions, cells enter microchannels, whereas 40-60% reverse direction when fluid is flowing. Courtesy of Johns Hopkins University. Credit Johns Hopkins University 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.