KLRG1 and hydrops fetalis: Supplementary Figure 8D shows the GSVA scores of four genes (KLRG1, LYAR, CD6, and DGKZ) in GSE59867 (16), which exhibited a similar trend. In addition, we considered the overlap between all DE genes from the dataset GSE59867 (16) and 115 genes from the B_C4 marker genes for the analysis. We obtained a total of 84 genes. We used these 84 genes for protein interaction network analysis using the STRING online tool. Among them, the upregulated gene with p < 0.05 and multiple linker proteins greater than 10 was ITGB2, which may play an important role in HF patients after MI (Figure 6).