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. 2021 Feb 12;43(1):225–237. doi: 10.1007/s11357-021-00329-x

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© The Author(s) 2021

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Fig. 2 — k-means clustering of genes differentially expressed in at least one comparison (n = 311 genes). The x-axis shows the sample ages, and y-axis represents the normalized expression counts value after z-score normalization. Cluster 1 (n = 60 genes), Cluster 2 (n = 134 genes), and Cluster 3 (n= 117 genes)