Cloning of pLEX_305-N-dTAG-KRASG12V was previously described.26 (link) pLEX_305-C-dTAG-LACZ was generated by cloning LACZ (Addgene, #25893) into pLEX_305-C-dTAG using gateway recombination cloning technology (Invitrogen) as previously described.26 (link) In addition to an N- or C-terminal FKBP12F36V tag, respectively, these plasmids contain tandem HA tags for monitoring of protein expression and a puromycin selectable marker.