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A, the proportion of neurones sensitised in the presence of 10 μm neomycin, 20 nm wortmannin, 10 μm Sos-inhibitory peptide and 10 μm U0126, to inhibit PLC, PI3K, ras and MEK activation respectively. B, mean ratio values of sensitised neurones. Error bars show means ± s.e.m. Significance levels: *P < 5 %; **P < 1 %; ***P < 0.1 %.
