SUMOylation exerts an impact on the protein level and localization of Aurora B in granulosa cells. (A) granulosa cells were co-transfected with HA-Aurora B (2 μg) and Flag-SUMO2 (2, 3, 4, and 5 μg), and the protein level of Aurora B was determined by western blotting. (B) Scanning intensity analysis of the western blots. Each experiment was repeated three times, and the values are presented as the mean ± standard deviation. **P<0.01 cf. the 2 μM value. (C) The co-transfection of HA-Aurora B or HA-Aurora BK207R with Flag-SUMO2. Localization was observed using immunocytochemistry. FITC indicated the localization of HA-Aurora B and/or HA-Aurora BK207R, Cy3 indicated the localization of Flag-SUMO2, and DAPI indicated the granulosa cells' nuclei (the images are magnified at ×20). SUMO2, small ubiquitin-related modifier 2; FITC, fluorescein isothiocyanate.