Fig. 4
From: Modified allele-specific PCR improves HER2 Ile655Val detection by reducing genotyping errors
The present of a G-quadruplex sequences in HER2 Ile655Val amplicon with GG genotype that causes ADO. Nucleotide bases with underline represent the possible G-quadruplex structures. Nucleotide with red colour represents SNP for G variant HER2 allele