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. 1997 Feb 24;136(4):871–882. doi: 10.1083/jcb.136.4.871

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Ultrastructure of the NMJ in utrn+/− and utrn+/− mice. (a–d) Electron micrographs of NMJs from P11 (a and b) and P50 mice (c and d). Nerve terminals and Schwann cells appeared normal in the mutant, but there were fewer junctional folds in mutant than in control postsynaptic membranes. (e) Average number of folds per micron of primary synaptic cleft in utrn+/+, utrn+/−, and utrn−/− mice at P11 and P50. Each bar shows mean ± SEM of measurements from 37–136 synapses. Bar in d is 1 μm for a–d.