Fig. 3From: Role of epigenetics in the clinical evolution of COVID-19 disease. Epigenome-wide association study identifies markers of severe outcomeUnsupervised hierarchical clustering. Heatmap showing unsupervised hierarchical clustering of 187 samples using the 880 differentially methylated CpG sites obtained in differential methylation analysis (RnBeads). The blue color indicates hyper-methylation while red indicates hypo-methylation. Green bars represent “severe” COVID-19 patients. Orange bars represent “mild” patients (used as controls). Cluster analysis was performed using the “complete” clustering method and assuming Euclidean distancesBack to article page