Fig. 5From: A piggyBac-based TANGO GFP assay for high throughput screening of GPCR ligands in live cellsAnalysis of the transgene copy number in 4 clonal cell lines. a qPCR was performed to measure the eGFP copy number in 4 clonal cell lines. b Long-term stability of 4 clonal cell lines. The GAPDH gene was amplified as an internal control to normalize the amount of genomic DNABack to article page