Fig. 1. Videoimages of a 20-μm arteriole chosen for study (A ), and the same vessel filled with fluorescein isothiocyanate–conjugated bovine serum albumin dye after a bolus injection (B ). The 20-μm arteriole chosen for study is shown by the arrows (A ). The centerline region that was analyzed is outlined by the rectangle, and the dashed lines show 25-μm calibration (B ).