Cross-sections of distal region of Cyprinus carpio caudal fin 10 days after regeneration. 15. Picrosirius-hematoxylin stained sections of control group. E: epidermis in regeneration; CR: conjunctive tissue in regeneration; Black arrows: actiniotrichia in regeneration. 16. Picrosirius-hematoxylin stained sections of treated group with dexamethasone (20 mg/L). E: epidermis in regeneration; CR: conjunctive tissue in regeneration; Black arrows: actiniotrichia in regeneration; Bar: 10 µm.