Video 4. In-capillary rheotaxis of CatSperz +/- and -/- spermatozoa; capacitated, related to Figure 6.

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DOI: 10.7554/eLife.23082.021

Capacitated epididymal spermatozoa in HTF for 90 min were loaded into the capillary and transferred to a 37°C chamber; sperm cells swimming against the flow and down were recorded; video rate 33 fps, 9 s movies. (A) CatSperz+/- and (B) CatSperz-/- spermatozoa.

DOI: http://dx.doi.org/10.7554/eLife.23082.021