Extreme wing fluctuating asymmetry in flies overexpressing CycG. Two asymmetrical individuals overexpressing CycG ubiquitously in a w1118 background under the control of the daughterless (da) driver. Photos of the two wings are superimposed: in red the left wing and in green the right wing.

For more information see, Asymmetric flies: The control of developmental noise in Drosophila by Debat and Peronnet.