STIM1 and hydrops fetalis: Using Fluoview software (version 4.2a; Olympus, Melville, NY), we calculated the Pearson's correlation coefficient for co-localization of ORAI/STIM1, which was significantly high in the hVF-HF group (0.5±0.01; n=63 cells from three different patients) compared to the control group (0.4±0.01; n=181 cells from three different individuals, P<0.01; Fig. 6).