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Cut open along its length, this tadpole tail cutaway shows what lies inside a regrowing tail, a classic subject of bioelectricity and regeneration research. The rounded head carries bulging eyes and small pits, while the tail is opened to reveal the spinal cord, the stiff notochord rod beneath it and rows of segmented muscle blocks, all wrapped by a thin fin edge. The smooth skin contrasts with the detailed interior. It makes a fascinating piece for a biology classroom, a regeneration lecture or a display shelf.

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