Fig. 4From: Long-term exposure to polystyrene microplastics triggers premature testicular agingCharacterization and internalization of PS-MPs. a PS-MPs with 1 μm particle size observed under scanning electron microscope. b Fluorescent PS-MPs with 1 μm particle size observed under CLSM. c Internalization of PS-MPs in TM4 cells. Scale bars: 30 μm in b and 50 μm in cBack to article page