APOE and Anxiety: Female 5xFAD mice that express human APOE4 (E4FAD) exhibit increased anxiety-like behavior relative to E3FAD, and ovariectomy (OVX) in E3FAD mice increases anxiety to a similar level to intact and OVXed E4FAD mice, suggesting a protective role of ovarian hormones against anxiety-like phenotypes in E3FAD but not E4FAD mice (Taxier et al., 2022).