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Fig. 4A Chorioallantoic membrane assay. Injection of aqueous
fluorescein isothiocyanate dextran (FITC) before diesel oil. Vein running from
center to right-hand side of image (black arrow) and capillary plexus
are filled with FITC. However, diesel oil is confined to artery on left-hand
side (arrowhead); it penetrates no farther than small supplying
vessels (white arrows). Capillaries are free of oil.