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We thank R. Nordin I. Santana-Stamm H. Geiger D. Labusch C. Weiler and C. Weiler for help with testis freezing in vitro fertilization and fin clipping and the Tubingen 2000 screen consortium; S. Wicks F. Verbeek and E. Berezikov for help with bioinformatics; D. Jongejan-Zivkovic F. van Eeden E. Cuppen and G. Stott for stimulating discussions and help with preparation of the manuscript; and L. Steiner for sharing unpublished results and providing primer sequences. R.H.A.P. is supported by a SPINOZA grant from the Netherlands Organization for Scientific Research. Supporting Online Material www.sciencemag.org/cgi/content/full/297/5578/99/DC1 Materials and Methods