GRIN1 and hydrops fetalis: Regarding the glutamatergic receptors, the highest relative expression was detected for GRIA2 (Figure 5G) followed by GRIN1 (Figure 5A) and GRIA3 (Figure 5H), while the lowest levels were measured for GRIN2C (Figure 5C) and GRIN3B (Figure 5E) in the HF of the control group.