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Schematic diagram of the clinostat used to produce a vector‐free gravitational environment. The clinostat was set in an incubator in 5% CO2 at 37°C and 100% relative humidity. The clinostat rotation is the rotation in the perpendicular direction around a horizontal rotation axis. The rotation control is rotated in a horizontal direction. The microtube containing the specimen was fixed at the center along the rotation axis. HTF, human tubal fluid; (░), sperm in HTF.
