Longitudinal sections of distal region of Cyprinus carpio caudal fin 10 days after regeneration. 13. Picrosirius-hematoxylin stained sections of control group. Black arrow: amputation site; L: old lepidotrichium (non-regenerated); Thin black arrows: lepidotrichium in regeneration; E: epidermis in regeneration; C: non-regenerated conjunctive tissue; CR: conjunctive tissue in regeneration. 14. Picrosirius-hematoxylin stained sections of treated group with dexamethasone (20 mg/L). Black arrow: amputation site; L: old lepidotrichium (non-regenerated); Thin black arrows: lepidotrichium in regeneration; E: epidermis in regeneration; C: non-regenerated conjunctive tissue; CR: conjunctive tissue in regeneration; Bar: 200 µm.