A study led by Charlotte Hedenstierna-Jonson, published in September 2017, noted Kjellström's "osteological analysis triggered questions concerning sex, gender and identity among Viking warriors". Hedenstierna-Jonson's team extracted DNA from samples taken from a tooth and an arm bone of the person buried in Bj 581. The skeleton had two different X-chromosomes, but no Y-chromosomes, conclusively proving that the bones were that of a female.
