Signosis' EGFR del19 (746–750) & T790M cell line is a stable Ba/F3 cell line expressing EGFR with the exon 19 deletion (AA 746–750) and T790M mutation. The cell line was generated by electroporation with a vector containing the mutant EGFR gene, along with GFP and hygromycin resistance. Clones were selected based on hygromycin resistance, GFP expression, and confirmed mutant EGFR protein expression.