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Ultrastructure of ARPE-19 cells after insulin treatment. The ARPE-19 cells were treated with 1 µg/mL of insulin for 24 h. Transmission electron microscopy of Nuclei (N), basal infoldings (BI), endoplasmic reticulum (ER), defective melanin vesicle (*), melanin vesicle (MV), and mitochondria (Mt) in ARPE-19 cells. Scale bars: 2 μm on the left pictures, 0.5 μm on the right pictures
