Human leukocyte interactions with the human microvasculature. A. Representative image of a FITC-conjugated Ulex europaeus-stained human post-capillary venule from the control SCID-hu mouse. B. Representative image of rhodamine 6-G labelled human leukocytes rolling and adhering to a Ulex europaeus-stained human post-capillary venule after 4-hour L-NAME treatment (50 mg/kg b.w., i.p.) in SCID-hu mice.