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She decided to look at this effect more carefully, asking Hutterite women to keep diaries recording all their menstrual periods. The genes may affect the concentrations of volatile acids in body fluids, such as urine, blood, breast milk or even sweat. Would its impact on fertility be more readily seen if women in the developing world took a shine to it? Yamazaki and Beauchamp suggested that the large number of Hutterite couples studied and the special characteristics of the culture may have made this group better than the Amazonian tribes for detecting a small but real effect. Kunio Yamazaki at the Monell Chemical Senses Center in Philadelphia has found that mouse embryos conceived by parents with dissimilar MHCs are more likely to make it to term.

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Of the women, 27 had miscarriages, and there were 38 miscarriages altogether.

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They made two separate calculations of how many couples would end up matching for certain haplotypes, or "linked" MHC genes found close together on chromosome 6, if there was no active avoidance of mates with similar MHCs. Pregnant women -- and women whose bodies are tricked into thinking they're pregnant -- might have the same tendency, says Wedekind. Each person has a unique combination of MHC genes that encode various components of their immune system. Even so, it might be worth taking precautions. So it's not inconceivable that the Pill is meddling with whatever chemosensory perception we have.

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