To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie S1. A movie of control cauda spermatozoa incubated in a BWW medium. The tracks of three spermatozoa show progressive motility. PTEN signaling through RAF1 proto-oncogene serine/threonine kinase (RAF1)/ERK in the epididymis is essential for male fertility Bingfang Xu, Angela M. Washington, and Barry T. Hinton PNAS. 2014. DOI: 10.1073/pnas.1413186112 Download Original Video Browse All Videos »