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Examples of Sanger sequencing of CTNNB1 exon 3 from glomangiopericytomas analyzed in this study. Arrows indicate single-nucleotide substitutions: c.98C>G in codon 33 (a), c.109T>G in codon 37 (b), c.121A>G in codon 41 (c), and c.133T>C in codon 45 (d).
