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The semen of people, pigs and mice affects the female reproductive tract, and the question is whether it can also produce behavioural responses in female mammals similar to those seen in fruit flies. Chapman thinks this kind of seminal signalling is widespread in the animal world. In flies, seminal proteins can directly affect behaviour because they enter the circulatory system, travelling throughout the body to the brain. In many animals, seminal fluid alters both the bodies and sometimes even the behaviour of females. One study, based on a survey of students, even found that women whose partners did not use condoms scored lower on a measure of depression. If that effect is real, depression in some people might be treatable with artificial-semen suppositories. Some people have extremely sweaty palms - but spraying Botox may help Net zero goals are galvanising action on climate change at long last.

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The genetic revolution: Can we predict school performance from DNA? Now a team led by Tracey Chapman at the University of East Anglia in Norwich, UK, has found that male fruit flies selectively alter the chemical make-up of their seminal fluid. Trending Latest Video Free. She has shown that seminal fluid induces expression of a range of genes in the cervix, including ones that affect the immune system, ovulation, the receptivity of the uterus lining to an embryo, and even the growth of the embryo itself.

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