Fig. 2 (IMAGE) Osaka University Caption Maturing sperm sense “electrical signals”. Immature spermatozoa sense “electrical signals” and the lipid composition of the cell membrane is appropriately regulated by the enzymic activity. Credit Takafumi Kawai Usage Restrictions Only noncommercial uses of the work are permitted 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.