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Representative examples of ATR genotypes. Mutation in A10 mononucleotide repeat in ATR exon 10. T1231: microsatellite instability (MSI)–positive tumor, A9 mononucleotide illustrates deletion (arrow). T1138: Microsatellite stable tumor, A10 mononucleotide illustrates wild type. T1062: MSI-positive tumor, A11 mononucleotide illustrates insertion (arrow). T, tumor; A, adenine; C, cytosine; T, thymine; G, guanine; N, base unrecognized by chromatography's software (ABI, Foster City, CA).
