Book excerpt: This volume comprehensively covers new technologies and methodologies that have appeared for the study of mouse development - Update of volume 225, Guide to Techniques in Mouse Development, edited by P.M. Wassarman and M.L. DePamphilis and published in 1993 - Comprehensively covers: - new techniques for the cryopreservation of gametes and embryos - production of transgenic and null (knockout) animals (use of ES cells) - generation of conditional/inducible mutant animals, use of gene-trap mutagenesis - analysis of allele-specific expression, use of new reporter constructs - humanizing of transgenic animals - transcript profiling of mouse development - imaging of mouse development - rederivation of animals and use of mouse genomics