Fig. 2 (IMAGE) Osaka University Caption Changes to the sperm. C. elegans sperm are activated and exhibit amoeboid movement. Mouse sperm undergo the acrosome reaction, exposing molecules essential for fusion with eggs. MO: membranous organelle. Credit 2023, Masahito Ikawa, 2023 Morohoshi et al., Science Advances Usage Restrictions Credit must be given to the creator. License CC BY 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.