Glycogen accumulates in phagocytes from hematopoietic-linage-specific FLCN-deficient mice, the kidneys from kidney-specific FLCN-depleted mice, and renal tumors from BHD patients (Possik et al., 2015; Endoh et al., 2020). The gene discussed is FLCN; the disease is Birt-Hogg-Dube syndrome.