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Segregation of ATM gene variants in a Peruvian family. The proband (arrow) and individual II-1 presented ataxia. The mother (I-2) developed gastric and breast cancer. The heterozygous carrier sisters (II-3 and II-5) were clinically healthy. Individuals I-1, II-1, and II-2 were not tested. The ages in this pedigree correspond to the first consultation of the proband.
