To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Movie 2 Sperm differentiation in 144 hours post isolation (hpi) culture. Establishing and maintaining primary cell cultures derived from the ctenophore Mnemiopsis leidyi Lauren E. Vandepas, Kaitlyn J. Warren, Chris T. Amemiya, and William E. Browne Journal of Experimental Biology 2017. 220:1197-1201; doi: 10.1242/jeb.152371 Download Original Video