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Synaptotagmin-1 in supraoptic nucleus (SON) neurones. In hypothalamic sections (A–C) and isolated SON neurones (D–F), synaptotagmin-1 immunoreactivity is present around, but not in magnocellular neurones. In posterior pituitary sections (G–I), synaptotagmin-1 is present in peptide immunoreactive axon terminals. Scale bars = 10 μm. VP, vasopressin.
