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Fig. 4. Gap junctions are smaller in {alpha}8–/– lenses. Gap junctions in the lens cortical fibers from wild-type (+/+), {alpha}3 (–/–), and {alpha}8 (–/–) mice were examined by thin-section (upper panels) and freeze-fracture (lower panels) electron microscopy. Gap junctions are indicated by arrows. Scale bar, 60 nm.