mouse strain 129X1/SvJ mouse strain Person:Jie Zheng 129X1 129/SvJ http://www.informatics.jax.org/mgihome/nomen/strain_129.shtml http://jaxmice.jax.org/strain/000691.html A mouse strain that is a laboratory mouse generated from inbreeding. It has white-bellied, pink-eyed, light chinchilla (off-white) or albino or white-bellied, pink-eyed, light chinchilla (light tan). It has a good reproductive performance and is widely used in the production of targeted mutations due to the availability of multiple embryonic stem cell lines derived from them.