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Typical reorientation maneuvers of swimming C. elegans. Shown are time-lapse images of a swimming C. elegans (A) performing a 2D turn and (B) rapidly switching the plane of undulations in a 3D roll maneuver. The nematode moves from right to left in both A and B. The arrows in B indicate the location of the ovary, helping to identify the nematode body orientation. (Magnification: 1.6×.)
