After publishing the protocol (https://bio-protocol.org/e3533), we realized that there is a typo in the Recipes. In section 3, under the scopolamine working solution, we mentioned adding 950 µl of scopolamine stock solution to 50 µl of 0.9% sterile saline; it should be 50 µl of scopolamine stock solution and 950 µl of 0.9% sterile saline.