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Human body odor has been associated with the human leukocyte antigens (HLA) genomic region.But the science of using genes to predict long-term compatibility is only in its infancy, said Mike Dougherty, director of education for the American Society of Human Genetics."If this is a marathon, we're still inside the first mile," he said.When it comes to determining the success of relationships, there are so many other genes and environmental factors that come into play, Dougherty said.DNA results become part of each user’s profile, and members can search for and evaluate potential matches based on their genetic compatibility.Instant Chemistry and Singld Out are not the first to promote genetic testing to determine romantic compatibility. In a crowded field of online dating sites, Singld claims to be the first offering matches based on your DNA."There is a science behind attraction," said Elle France, co-founder of Singld Out.com, in an interview with USA TODAY Network.