This research shows that a protein called PTP1B plays an important role in protecting the body against dangerous yeast infections caused by Candida albicans. When this protein is missing from immune cells, mice become much more susceptible to severe fungal infections. The study found that PTP1B helps immune cells called macrophages and neutrophils kill fungi effectively, and when it’s absent, these immune cells work poorly. This discovery suggests that targeting PTP1B could be a new way to help patients fight off serious fungal infections.