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Concentration-response curves of acetylcholine and nicotine derivatives on the C. elegans (A) and P. equorum (B) N-AChRs expressed in Xenopus oocytes. The N-AChRs were challenged with acetylcholine (ACh), nicotine (Nic), anabasine (Ana) and nornicotine (Nor). All responses are normalized to 1 mM Ach. Results are shown as the mean ± se.
