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Oxygen isotope analysis, which can reveal the type of water the woman drank as she grew up - and which areas the water came from. Strontium isotope analysis, which can reflect the types of Skip Trace food the woman ate, and the type of soil in the area where she grew up. It's the first time Norwegian police have conducted isotope analysis on teeth - but they hope the findings will help them pinpoint the region where the woman lived. DNA analysis is now one of the key tools police use in forensic analysis and identification cases. But it turns out several tissue samples from the woman's organs, including from her lungs, heart, adrenal gland and ovaries, have been stored at Haukeland University Hospital. Prof Morild says it "has been a custom in most of Norway" to keep tissue samples from post mortem examinations. The samples are "useful for repeat examinations, and as a source of DNA". Image caption Tissue samples from the organs are preserved in paraffin blocks Image caption Prof Inge Morild looks through tissue samples belonging to the Isdal Woman Skiptracing sites NRK and local police agree to send the samples off for DNA analysis. Nils Jarle Gjøvåg, head of forensics at West Police District, says it's important to pursue the woman's identity because "somewhere in the world, there may be some relatives wondering where she went". "We try to identify every unknown body, so that relatives can have an answer." While they wait for DNA results, NRK publish a documentary into the investigation - and receive more than 150 tip offs from people interested in the case. "In Norway, this case is a big enigma for people… there's a lot of people who want some sort of closure in the case," says journalist Ståle Hansen.
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