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One of the planarian species used in this study, Girardia (Dugesia) tigrina, was actually the planarian species Girardia (Dugesia) dorotocephala. This mix-up was caused by an error in the information provided by the supplier. All data and conclusions still hold true, but everything related to G. tigrina is instead only valid for G. dorotocephala. The authors would like to apologize for any inconvenience caused and for not catching this mix-up earlier.