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Bellard, M. & Frasch, M. BioEssays 23, 125–133 (2001). Stamatoyannopoulos, G. & Grosveld, F. , Majerus, P. , Perlmutter, R. M. ) 135–182 (Saunders, Philadelphia, 2001). 4 brief comm MH 31/3/05 3:32 pm Page 717 brief communications Dante’s insight into galilean invariance The poet’s vividly imagined flight unwittingly captures a physical law of motion. n 1632, Galileo described his experience of motion aboard a large ship1,2 and exposed in detail the invariance principle, which was then rightly named after him.

Palumbi is in the Department of Biological Sciences, Hopkins Marine Station, Stanford University, Pacific Grove, California 93950, USA. edu 1. Pandolfi, J. M. et al. Science 307, 1725–1726 (2005). 2. Pandolfi, J. M. et al. Science 301, 955–958 (2003). 3. Harden, V. Hist. Phil. Life Sci. 14, 249–269 (1992). 4. , Folke, C. & Moberg, F. Trends Ecol. Evol. 15, 413–417 (2000). 5. Halpern, B. & Warner, R. Ecol. Lett. 5, 361–366 (2002). 6. Russ, G. R. & Alcala, A. C. Coral Reefs 18, 307–319 (1999). 7.

The pink cluster of homeobox genes shading for the Rhox7 gene shows that, in sequence terms, it is that are expressed during more closely related to the Ȋ than the ȋ subcluster. the development of germ cells. The clustering of these genes may placenta. Within the testis, they are mainly help to determine their spatial and temporal expressed in Sertoli cells, some under the control of androgen hormones. regulation. They are found in all animals, between the genomic organization of the from mammals to fruitflies, and they are subclusters and the expression of the genes essential for numerous aspects of embryonic within them.

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