A set of 14 immune cell types (activated CD4+ T cell, activated CD8+ T cell, activated dendritic cell, CD56dim natural killer cell, MDSC, macrophage, natural killer T cell, natural killer cell, neutrophil, Type 17 T helper cell, Type 2 T helper cell, effector memory CD4+ T cell, memory B cell, central memory CD8+ T cell) overlapping between Lasso and RF was considered to contain the key immune cell types of HF. This evidence concerns the gene CD4 and hydrops fetalis.