The TrkA: IENFD ratio was greater in Std week 8 (0.78 ± 0.02) compared to week 4 (0.70 ± 0.03, p = 0.039) and greater in HF at week 8 (0.78 ± 0.02) compared to week 2 (0.75 ± 0.04, p = 0.039) (Figure 3C). This evidence concerns the gene NTRK1 and hydrops fetalis.