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How two butterfly species have evolved exactly the same striking wing colour and pattern has intrigued biologists since Darwin's day. Now, scientists at ¹ú¼ÊÃ×À¼¶ÔÕó¿ÆĪ have found "hotspots" in the butterflies' genes that they believe will explain one of the most extraordinary examples of mimicry in the natural world.

One of the latest technologies to emerge - metabolomics - is being used to create a snapshot of how environmental chemicals affect living organisms.