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Figure 4 (A) Photomicrograph of red blood cell aggregates: washed red blood cells (hematocrit = 58%) and fibrinogen = 166 mg/dl. The videodensity was 24.0. (B) Photomicrograph of red blood cell aggregates: washed red blood cells (hematocrit = 58%) and fibrinogen 349 = mg/dl. The videodensity was 50.0. (C) Photomicrograph of red blood cell aggregates: washed red blood cells (hematocrit = 58%) and fibrinogen = 493 mg/dl. The videodensity was 59.0.