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An Indiana woman undergoing surgery in Los Angeles to remove a tumor experienced a twist worthy of a sci-fi plot when doctors discovered an embryonic twin in her brain.

Researchers tested pairs of identical and non-identical twins to see how attractive they were to mosquitoes. Identical twins were more likely to have similar levels of attractiveness - suggesting shared genetic factors were at play. The "intriguing" results must now be assessed in larger trials, experts say. Researchers have long tried to understand what drives mosquitoes to bite certain people more than others. Recent work shows the insects may be lured to their victims by body odour.