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Marking transgenic Xenopus froglets with passive micro transponders

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Standard methods to mark Xenopus laevis individuals like tattooing or clipping toenails are inappropriate for the fast growing and regenerating small froglets and the previously used transponders are too large. In this study we successfully adapted micro transponders to tag these animals. Using these new transponders one can now tag small froglets directly after metamorphosis, which has not been possible previously. This new technique makes the breeding of transgenic frogs most efficient, because the frogs do not have to be kept separately and they grow much faster when kept together in large containers.

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  • Caja G, Hernandez-Jover M, Conill C, Garin D, Alabern X, Farriol B, Ghirardi J (2005) Use of ear tags and injectable transponders for the identification and traceability of pigs from birth to the end of the slaughter line. J Anim Sci 83:2215–2224

    PubMed  CAS  Google Scholar 

  • Conill C, Caja G, Nehring R, Ribo O (2000) Effects of injection position and transponder size on the performances of passive injectable transponders used for the electronic identification of cattle. J Anim Sci 78:3001–3009

    PubMed  CAS  Google Scholar 

  • Conill C, Caja G, Nehring R, Ribo O (2002) The use of passive injectable transponders in fattening lambs from birth to slaughter: effects of injection position, age, and breed. J Anim Sci 80:919–925

    PubMed  CAS  Google Scholar 

  • Nakajima K, Fujimoto K, Yaoita Y (2005) Programmed cell death during amphibian metamorphosis. Semin Cell Dev Biol 16:271–280

    Article  PubMed  CAS  Google Scholar 

  • Nieuwkoop PD, Faber J (1994) Normal table of Xenopus laevis (Daudin). Elsevier North Holland Publishing Company, Amsterdam

    Google Scholar 

  • Santoso A, Kaiser A, Winter Y (2006) Individually dosed oral drug administration to socially-living transponder-tagged mice by a water dispenser under RFID control. J Neurosci Methods 153:208–213

    Article  PubMed  CAS  Google Scholar 

  • Sive H, Grainger RM, Harland RM (2000) Early development of Xenopus laevis: a laboratory manual. Cold Spring Habor Laboratory Press

  • Waldner C, Sakamaki K, Ueno N, Turan G, Ryffel GU (2006) Transgenic Xenopus laevis strain expressing Cre recombinase in muscle cells. Dev Dyn 235:2220–2228

    Article  PubMed  CAS  Google Scholar 

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Correspondence to Christoph Waldner.

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Waldner, C., Roose, M. & Ryffel, G.U. Marking transgenic Xenopus froglets with passive micro transponders. Transgenic Res 16, 539–540 (2007).

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