Form and Function (VIDEO) University of Pennsylvania School of Medicine This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption Microtubule and membrane dynamics of yeast cells inside a curved channel – new cell tip formation. Color time-lapse movie of several wild-type yeast cells growing inside a curved channel. The cell on the far left attempts to form a new cell tip where its microtubules make frequent contact with virgin cell membrane. This is evident by an increase in the intensity of the green-stained membrane, indicative of new polarized cell growth, and attempted protrusion of a new cell tip. However, this new cell tip remains confined within the channel. Serendipitously, due to a small piece of dirt (green amorphous spot) which creates a small opening in the channel, the cell on the far right can successfully make a new protruding cell tip at the site of microtubule and virgin membrane contact. Credit Phong Tran, PhD, University of Pennsylvania School of Medicine 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.