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Effects of α-conotoxins ImI (ImI), α-bungarotoxin (BGTx), and MLA on 45Ca2+ entry into chromaffin cells stimulated with ACh. Cells were incubated for 30 min with the compounds at the concentration of 100 nM. Data are means ± SE of the number of wells shown in parentheses on top of each bar, from at least four different batches of cells. ***P < 0.001, compared with controls.
