Representative photomicrograph of thyroid tissue structure in BaP treated L. abu on day 7 (A: 2 mg/kg-bw; B: 10 mg/kg-bw; C: 25 mg/kg-bw) and day 14 of experiment (D: 2 mg/kg-bw; E: 10 mg/kg-bw; F: 25 mg/kg-bw). Thyroid follicle (black arrows), interstitial connective tissue (black arrowhead), colloid fluid (black), vacuoles in colloid fluid (grey arrowhead), Hemorrhage (white), bronchial artery (white arrow), interstitial connective tissue (black arrowhead). A,B,C,F (H&E; 725X); D,E (H&E; 290X).