CD4 and hydrops fetalis: Employing the CIBERSORTx algorithm, the HF group exhibited a higher proportion of plasma cells, CD8+ T cells, naive CD4+ T cells, M0 macrophages, M1 macrophages, resting mast cells, and eosinophils, and a lower proportion of M2 macrophages and neutrophils compared to the healthy group, across the spectrum of 22 immune cell types (Figure 8A).