Fig. 3 (IMAGE) Osaka University Caption <b>Confocal microscopic observation of <i>Fimp-mCherry</i> Tg mouse spermatozoa.</b> The TM form of FIMP and mCherry fused protein (red signals) were localized to the equatorial segment of the sperm head in acrosome-intact spermatozoa (Acr-EGFP [green signals] positive). However, after the acrosome reaction (Acr-EGFP [green signals] negative), both fluorescent and nonfluorescent spermatozoa were observed. 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.