Abstract
The coexistence of γ-aminobutyric acid (GABA) and glycine in axon terminals impinging on rat abducens motoneurones was investigated using a double staining procedure combining retrograde labelling of the motoneurones with HRP and post-embedding immunocytochemical staining of axon terminals. Adjacent ultrathin sections of cell bodies of identified motoneurones were individually treated with GABA or glycine antibodies. The terminals single labelled for GABA represented 11.4% of the terminals analyzed, while 8% of them were glycine immunoreactive and 9% were both GABA and glycine immunoreactive. All the labelled terminals contained pleomorphic vesicles. The mean length of apposition of the double labelled terminals was statistically larger (2.20 ± 0.97 μm) than the GABA (1.65 ± 0.57 μm) or glycine immunoreactive ones (1.37 ± 0.35 μm).
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