Fig. 1 (IMAGE) Osaka University Caption <b>Observation of sperm-oocyte fusion in wild-type and <i>Fimp KO</i> spermatozoa. </b><i>Fimp KO</i> (-1/-1) spermatozoa have impaired oocyte membrane fusion ability <i>in vitro</i>. Fused spermatozoa are indicated by green arrowheads. Enlarged images are indicated by dashed squares. Credit Original image from <i>PNAS</i> (Fujihara et al). 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.