Fig. 4From: Proteomic analysis identifies a signature of disease severity in the plasma of COVID-19 pneumonia patients associated to neutrophil, platelet and complement activationA Hierarchical cluster analysis of plasma protein correlation values. Euclidean distance were used to compare different groups and clusters were extracted using either n = 4 or n = 15 to allow a better discrimination of clusters containing lower abundant proteins. B GO pathways enriched among plasma proteins that exhibited progressively increased expression in non-ICU and ICU/F COVID-19 patient groups with respect to HDanalysed in each cluster identified in A. C GO pathways enriched among plasma proteins that exhibited increased expression mainly in COVID-19 ICU/F patient groups with respect to COVID-19 non-ICU and HDanalysed in each cluster identified in A. Top score processes resulting from the GO-based enrichment analysis (see Fig. 3) are highlighted in redBack to article page