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Sperm behaviors between adjacent mucosa folds show a diversity of activities. (A-D) Representative trajectories show sperm swimming (A) along the mucosa folds (Movie 6), (B) across the gap between the mucosa folds (Movie 7), as well as circling (C) parallel and (D) perpendicular to the mucosa fold (Movies 8 and 9, respectively). Scale bars: 50 µm.
