Fig. 3 (IMAGE) Osaka University Caption Electron microscopic observation of sperm heads. Even with the addition of a strong inducer, the acrosome reaction (AR) does not occur in sperm lacking FER1L5, leaving the acrosome intact. 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.