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Maeda\n                    <jats:italic>et al.<\/jats:italic>\n                    examined the basis of specificity of a snake venom toxin binding to muscarinic acetylcholine receptors (MAChRs), which mediate many functions of the central and parasympathetic nervous systems. They determined a structure that shows why the mamba venom toxin MT7 is specific for one receptor, M\n                    <jats:sub>1<\/jats:sub>\n                    AChR, and also explains how it inhibits downstream signaling. Based on this structure, they engineered MT7 to be selective for another receptor, M\n                    <jats:sub>2<\/jats:sub>\n                    AChR, instead of M\n                    <jats:sub>1<\/jats:sub>\n                    ChR. 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