(IMAGE) Kumamoto University Caption HSF5 is required for spermatocytes to progress beyond the substage of meiotic prophase during spermiogenesis under non-stress conditions. Credit Kei-ichiro Ishiguro, Kumamoto University Usage Restrictions Cannot be used without prior permission 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.