The CCK-ires-Cre mice showed significantly increased freezing responses to the VS after HF-VS/EAC (Fig. 4S; two-way ANOVA, F(4,56) = 6.2, p = 3.4E-4 significant interaction; pairwise comparison, 3.33 ± 1.26% baseline vs 22.5 ± 5.84% at day 4, p = 0.040, n = 8; Movies 7, 8, 9, 10), but not after LF-VS/EAC (Fig. 4T; two-way ANOVA, F(4,32) = 0.91, p = 0.468; pairwise comparison, 14.7 ± 6.04% baseline vs 9.3 ± 4.22% at day 4, p = 1.000, n = 5; Movies 11, 12, 13, 14). Here, CCK is linked to hydrops fetalis.