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Unfractionated heparin titration. Comparison of anticoagulation effect of unfractionated heparin to 1/2 (0.2 U/ml) and 1/4 (0.1 U/ml) of the prophylactic dose (0.4 U/ml). Representative images are selected from SARS‐CoV‐2‐infected human umbilical vein endothelial cells (HUVECs) incubated with healthy child, healthy adult or vasculopathic adult plasma. Images are captured using scanning electron microscopy and presented at 5000× magnification
