it's an age-old story, boy meets girl, girl thinks he is kickecu. if you have not had as much luck, you might want to try the new age solution, swabbing your cheek. your hla is your immune system, detecting things like viruses and bacteria. this is your introduction to dna dating. >> i would say it is a component of partner selection, and it might be an accelerator a partner selection. >> scientific match, gene partner and other web sites promised to booster shot at long-lasting luck of biological combat ability. it turns out quite a few of their clients are sending their samples to oklahoma. typically an anonymous couple would send in their swabs in an envelope like this to the lab. we put the plant in reverse and found a couple that has been together for 16 years to test a theory out. the companies claim put a whole new spin on the saying that opposites attract. they are put in test tubes and carefully processed to extract dna. step by step, your dna begins to show signs of life through data on grass. in theory, the more they are differentiated, t