Mus musculus 129 mouse strain http://www.informatics.jax.org/mgihome/nomen/strain_129.shtml James Malone 129 is a mouse strain as described in Jackson Laboratory http://www.informatics.jax.org/mgihome/nomen/strain_129.shtml Simpson E. M., Linder C. C., Sargent E. E., Davisson M. T., Mobraaten L. E., and Sharp J. J. (1997) Genetic variation among 129 substrains and its importance for targeted mutagenesis in mice. Nature Genet. 16, 19-27.