A blood vessel and 2 bile ducts (BD) are presenl; H & E X 375 Flg. 7 Oncorhynchus mykiss. Trout llver in a fish fed 500 ppm BNF for 1 wk prior to exposure to 0.5 mgl-' I 3 H ] - ~ F Bf,or 30 min and sacrificed 2 wk later Lack of cytotoxicity is striking; H & E x...