KLRK1 and hydrops fetalis: This not only showed significantly higher LDH release induced by ILC1lc than by co-culture with all three negative control cell populations (ILC2s, ILC3s, or PBMCs/PHA) but also even higher HF cytotoxicity levels than those induced by CD8+/NKG2D+ cells (p<0.01), namely after three days of co-culture (Figure 3).