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An erg current was recorded in a large multipolar embryonic rhombencephalon neurone (left, white arrowhead) with neurobiotin included in the pipette solution. The neurobiotin-filled neurone (centre, NB) was additionally immunostained with an antibody against tryptophan hydroxylase (right, TPH). Black arrowheads indicate TPH-negative cells. Scale bar: 40 μm.
