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Nerve-evoked synaptic currents are absent from the neuromuscular junctions of n-syb mutants stimulated at 0.3 Hz. Evoked currents are lacking in n-syb null mutantn-sybΔF33B(A) and in the mutantn-sybF33-R (B) but are present in the parental control, line 34 (C). The external solution contained 2 mm Ca2+ for linesn-sybΔF33B andn-sybF33-R and 0.5 mmCa2+ for line 34.
