Representative photomicrograph of thyroid tissue structure in control (A and B) and BaP treated L. abu (C: 2 mg/kg-bw; D: 10 mg/kg-bw; E and F: 25 mg/kg-bw) on day 4 of experiment. Thyroid follicle (black arrows), interstitial connective tissue (black●), colloid fluid (black), vacuolated cuboidal epithelial cell (white arrowhead), vacuoles in colloid fluid (black arrowhead), Hemorrhage (white). A,F (H&E; 290X); B (H&E; 2900X); C,D,E (H&E; 725X).