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Monitoring of platelet activity in the blood of healthy subjects before and after Pfizer‐BioNTech vaccine doses. (A) Experimental procedure. (B) Concentration of circulating platelet aggregates in a female subject. Insets show the size distribution and typical images of single platelets and platelet aggregates. Scale bars, 30 μm [Color figure can be viewed at wileyonlinelibrary.com]
