Many a mickle makes a muckle: How changes in animals' size and shape arise

How does nature's great diversity in the shape and size of organisms evolve? The group of David Stern at Princeton University has managed to show how in fruit flies a gene enhancer can change its function through stepwise changes in DNA sequence to give rise to differences in animals' appearance. Alistair McGregor of the University of Veterinary Medicine, Vienna, contributed to the work, which is published as an article in the current issue of Nature.

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