Introduction: strategies for developing genetically modified mice / Marten H. Hofker -- Genetic modification of the mouse : general technology-pronuclear and blastocyst injection / Jan Willem Voncken -- Generation of chimeras by aggregation of embryonic stem cells with diploid or tetraploid mouse embryos / Jérôme Artus and Anna-Katerina Hadjantonakis -- Cryopreservation of mouse spermatozoa and in vitro fertilization / Naomi Nakagata -- Autopsy and histological analysis of the transgenic mouse / Marion J.J. Gijbels and Menno P.J. de Winther -- Transgene design / Bart van de Sluis and Jan Willem Voncken -- Inducible transgenic mouse models / Thomas L. Saunders -- Lentiviral transgenesis / Terunaga Nakagawa and Casper C. Hoogenraad -- Transgenesis in mouse embryonic stem cells / Janine van Ree, Wei Zhou, Ming Li, and Jan M. van Deursen -- Engineering BAC reporter gene constructs for mouse transgenesis / Yu Fu and Peter Maye -- Targeting vector construction through recombineering / Liviu A. Malureanu -- Generating conditional knockout mice / Roland H. Friedel, Wolfgang Wurst, Benedikt Wefers, and Ralf Kühm -- Hypomorphic mice / Darren J. Baker -- MICER targeting vectors for manipulating the mouse genome / Chunhong Liu, Paul F. Szurek, and Y. Eugene Yu -- Knock-in approaches / Anton J.M. Roebroek, Philip L.S.M. Gordts, and Sara Reekmans -- Generation of a series of knock-in alleles using RMCE in ES cells / Anton J.M. Roebroek, Philip L.S.M. Gordts, and Sara Reekmans -- Selection of targeted mutants from a library of randomly mutagenized ES cells / Kyoji Horie, George Gaitanaris, and Alexander Gragerov -- Generation of genetically modified rodents using random ENU mutagenesis / Ruben van Boxtel and Edwin Cuppen -- Bone marrow transplantations to study gene function in hematopoietic cells / Menno P.J. de Winther and Peter Heeringa -- Adenovirus-mediated gene transfer / Ko Willems van Dijk, Kyriakos E. Kypreos, Frits J. Fallaux, and Jurre Hageman.