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One of the lessons I've learnt from your informative articles on DNA testing is that small percentages in ethnicity estimates can be misleading. I was therefore quite sceptical when my wife's test results) informed her that she had 4 per cent “Indigenous American” DNA. Nevertheless, this result was so intriguing that further research was needed. Only one of my wife's grandparents – her maternal grandmother, Ardell – had been born in the USA, so any Native American ancestry must have come via her. Ardell was still alive, at the age of 98, so we arranged for her to test too.