Figure 1. The difference analysis results of the three datasets. (A–C) PCA dimensionality reduction analysis, difference analysis volcano map and bidirectional clustering heat map of differential genes for GSE7158. (D–F) PCA dimensionality reduction analysis, difference analysis volcano map and bidirectional clustering heat map of differential genes for GSE56815. (G–I) PCA dimensionality reduction analysis, difference analysis volcano map and bidirectional clustering heat map of differential genes for GSE100609.