Movie 2

Frame from a microscopic video of Prss50 null sperm at 40X magnification demonstrating a sperm with two heads (blue circle; 0.1x speed) as well as conjoined sperm.

PRSS50 is a testis protease responsible for proper sperm tail formation and function

Jason M. Scovell, Juan C. Bournat, Adam T. Szafran, Minerva Solis, Joshua Moore, Armando Rivera, Ching H. Chen, Jason Zhang, Nathan Wilken, Abhishek Seth, and Carolina J. Jorgez

Development 2021. 148:None-None; doi: 10.1242/dev.197558