(VIDEO) Institute of Science and Technology Austria This video is under embargo. Please login to access this video. Caption Formation of the contraction pole. Microscopic time-lapse of cell shape changes in ascidian oocytes after fertilization: From an unfertilized egg to contraction pole initiation to contraction pole formation to contraction pole absorption. Credit ©Caballero-Mancebo et al./Nature Physics Usage Restrictions Free to use when reporting about paper. License Original 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.