Author Contributions
This study was designed by SN, NJ, CWW and MC. Wild butterflies were
collected by SN, NJ. Larval rearing, switch experiment and gut sampling
was performed by MC. RNA-extractions were done by MC (Switch A) and KS
(Switch B). Data were analysed by KS, RAS, DM and SN. The manuscript was
written by KS with the help of all the authors.