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Sequencing analysis of FGFR2 codon p.Ser252 and p.Pro253 in MFE-280 DNA spiked with DNA from UROtsa cells. Arrows indicate the FGFR2 p.Ser252Trp mutation in DNA from MFE-280 cells. The p.Ser252Trp mutation is still detectable in a background of >85% wild type DNA.
