The scientists from Peking University in Beijing tested hair samples from almost 600 Chinese university students to analyze a gene called 5-HTA1, which comes in two different versions. Those with the ‘G’ version were much more likely to be single than those with the ‘C’ version.
The key to the findings seems to be the role of the 5-HTA1 gene in the brain. Those with the ‘G’, or singleton, version make less serotonin, a brain chemical involved in mood and happiness. 5-HTA1 makes people less comfortable in close relationships.
This could make it harder to form them in the first place - or lead to break-up after break-up. People with the 'G' are also more likely to be neurotic and to suffer from depression. Some 60% were not in a relationship - compared to 50% of those in the 'C' group..
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