Endoskeleton of pectoral fin cannot be regenerated in adult zebrafish. (A) Intact pectoral fin in adult zebrafish stained with AR (B) Post-amputation pectoral fin in the adult zebrafish stained with AR. (C) Lateral view of the amputated fragment of pectoral fin in B stained with AR and AB. Solid arrowhead indicates remnants of prs. (D, E) Pectoral fin skeletons of intact (D) and at 84 dpA (E). Open arrowhead points to volume-enlarged endoskeleton. Scale bars: 200 μm.
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