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A) Interaction between acetylcholine and gallamine at native M2 mAChRs in the guinea pig electrically-driven left atrium. Data taken from [ 16]. B) Concentration-ratios (CR) were derived from the data in panel A and plotted in the form of a Schild regression. Solid curve denotes the fit of the ATCM to the data. Dashed line denotes the expected Schild regression for a simple competitive interaction.
