The past decade has witnessed a spectacular explosion in both the development and use of transgenic technologies.

Not only have these been used to aid our fundamental understanding of biologic mechanisms, but they have also facilitated the development of a range of disease models that are now truly beginning to impact upon our approach to human disease.

Some of the most exciting model systems relate to neurodegenerative disease and cancer, where the availability of appropriate models is at last allowing radically new therapies to be developed and tested.

This latter point is of particular significance given the current concerns of the wider public over both the use of animal models and the merits of using genetically modified organisms.

Arguably, advances of the greatest significance have been made using mammalian systems—driven by the advent of embryonic stem-cell–based strategies and, more recently, by cloning through nuclear transfer.

For this reason, this new edition of Transgenesis Techniques focuses much more heavily on manipulation of the mammalian genome, both in the general discussions and in the provision of specific protocols.