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View Article and Find Full Text PDFWe report one complex paternity case presenting a presumable paternal four-step STR mutation between the alleged father (AF) and child; the complexity of the case required the AF-brother hypothesis to be discarded without including this DNA sample. A total of 23 autosomal STR loci included in the Powerplex Fusion® and Globalfiler™ kits confirmed one isolated mismatch for D22S1045 between the AF (17/17) and the male child (13/15) in the presence of the mother (15/15). In this case, the STR structure and father's age do not seem to have contributed to promote the observed multistep mutation.
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