Figure 2. Function of SPATA33 (IMAGE) Osaka University Caption There are mitochondria in the sperm midpiece. SPATA33 has the function of connecting calcineurin and VDAC2 (mitochondrial protein). When SPATA33 is knocked out, calcineurin cannot localize to mitochondria and the midpiece cannot bend. Credit Haruhiko Miyata et al. Usage Restrictions None 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.