(A,B) Representative immunofluorescence microscopy images of the distribution of septin 7 (red), Cdc42 (red) and tubulin (green) in LT-HSCs from borg4fl/fl or borg4∆/∆ mice. Nuclei were stained with DAPI (blue), scale bar= 5 µm. (C) Percentage of cells with a polar distribution of septin 7, Cdc42 or tubulin in borg4fl/fl or borg4∆/∆ LT-HSCs. At least 3 biological repeats, at least 50 cells were scored per sample. Error bars indicate mean±SEM, Two-way ANOVA analysis, ***P<0.001, **P<0.01, *P<0.05. 