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Identical, or monozygotic, twins occur Pkmkb T Shirt when a single egg, fertilized by a single sperm, divides and makes two babies. These twins will be the same sex and share the same genes and physical features. Non-identical, or dizygotic, twins occur when two separate eggs are fertilized, each by different sperm, and develop in the womb at the same time.
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In this case of semi-identical, or, twins, the egg is thought to have been fertilized simultaneously by two sperm before it divided. If one egg is fertilized by two sperm, it results in three sets of chromosomes, rather than the standard two – one from the mother and two from the father. And, according to researchers, three sets of chromosomes are “typically incompatible with life and embryos do not usually survive”.
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The identity of the twins has not been revealed. Foster says research in this field is now rapidly accelerating, conducted both by university scientists and commercial companies; academic meetings, discussing the findings, are now “dime-a-dozen every week”.Ultimately, these researchers hope that their findings will offer a new treatment target for illnesses such as depression.
Existing antidepressants aim to alter the balance of chemicals such as serotonin in the brain, but they are not effective for all patients: only two out of every 10 patients taking antidepressant drugs show signs of improvement, over and above the placebo effect. And although they help many patients, talking therapies such as cognitive behavioral therapy are similarly hit and miss. As a Pkmkb T Shirt result, and the gut-brain axis would seem to offer one of the most promising lines of inquiry.