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Extra resources for Nature (Vol. 436, No. 7049, 21 July 2005)

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As each lamina is of the order of 1–2 mm thick, we agree that the aggradational © 2005 Nature Publishing Group ripples could have been deposited in a period of several hours, although this would require the entire climbing structure to be due to continuous aggradation. 5 m of carbonate sediment in a period of several hours is itself testimony to extreme conditions. What cannot be proved on the basis of the palaeohydraulic analysis alone is whether the structures formed under intense hurricanes in relatively shallow water, or in deeper water under more sustained but unsteady zonal winds during climatic transit.

Sci. 37, 1651–1684 (2002). 3. Ostro, S. J. Rev. Mod. Phys. 65, 1235–1279 (1993). 4. Belton, M. J. S. et al. Science 265, 1543–1547 (1994). 5. Sullivan, R. et al. Icarus 120, 119–139 (1996). 6. Prockter, L. et al. Icarus 155, 75–93 (2002). 7. Asphaug, E. & Melosh, H. J. Icarus 101, 144–164 (1993). 8. Greenberg, R. et al. 107, 84–97 (1994). 9. Asphaug, E. et al. Icarus 120, 158–184 (1996). 10. Richardson, J. , Melosh, H. J. & Greenberg, R. Science 306, 1526–1529 (2004). 11. Peplow, M. Nature 436, 158–159 (2005).

The general absence of large-scale sexual dimorphisms in fru-expressing neurons implies that it is the molecules regulated by fru that make the difference. Future work will undoubtedly be aimed at finding these molecules, as well as identifying the subset of key neurons that are sufficient to generate male courtship elements. 9 have identified neurons downstream of ones expressing fru that are implicated in the control of the male’s courtship song. Finally, an intriguing and mostly forgotten paper was published 30 years ago10 about ‘lesbian’ Drosophila females that courted the focus of attention for those interested in the debate (scientific and political) on the genetic versus environmental bases of human sexuality.

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