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A Ciona savignyi swimming tadpole imaged by Normarski microscopy. At this stage, notochord is a tubular lumen is at the center (*) encircled by endothelial-like notochord cells (arrows) in the periphery. The notochord at this stage plays an important role in locomotion by serving as a hydrostatic skeleton in the larval tail. Lateral view; anterior to the left.
