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Drawings illustrate examples of PMLS terminals categorized as singletons. A: A single bouton at the end of a long stalk of over 150 μm. B: A single axon can have multiple long stalks on which singleton endings are observed. C: Singleton terminals can arise from axonal collaterals of different diameters. Scale bars = 10 μm in B (applies to A,B); 10 μm in C.
