White blood cell paddling proteins (video) Cell Press Share Print E-Mail Loading video... Caption This video shows imaging of the backward treadmilling of paddling molecules outside the cell. Credit TIRF microscopy: N Garcia-Seyda Usage Restrictions Credit Required. Share Print E-Mail 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.