NLRP1 and hydrops fetalis: We found a significantly positive correlation between the overall numbers of HF neurons immunoreactive for NLRP1 and ASC per unit of tissue (Spearman’s coefficient of correlation rS = 0.54, p = 0.01, Figure 2A) as well as between the numbers of HF neurons immunoreactive for NLRP1 and CASP-6 per unit of tissue (rS = 0.49, p = 0.03, Figure 2B).